| Date | Data | Change | Unit |
|---|---|---|---|
| 01 January, 1973 | 102.1 | 0 | Trillion Btu |
| 01 February, 1973 | 92.287 | -9.813 | Trillion Btu |
| 01 March, 1973 | 102.172 | + 9.885 | Trillion Btu |
| 01 April, 1973 | 98.836 | -3.336 | Trillion Btu |
| 01 May, 1973 | 102.126 | + 3.29 | Trillion Btu |
| 01 June, 1973 | 98.84 | -3.286 | Trillion Btu |
| 01 July, 1973 | 101.693 | + 2.853 | Trillion Btu |
| 01 August, 1973 | 101.598 | -0.094999999999999 | Trillion Btu |
| 01 September, 1973 | 98.067 | -3.531 | Trillion Btu |
| 01 October, 1973 | 101.467 | + 3.4 | Trillion Btu |
| 01 November, 1973 | 98.41 | -3.057 | Trillion Btu |
| 01 December, 1973 | 102.032 | + 3.622 | Trillion Btu |
| 01 January, 1974 | 101.58 | -0.452 | Trillion Btu |
| 01 February, 1974 | 91.781 | -9.799 | Trillion Btu |
| 01 March, 1974 | 101.514 | + 9.733 | Trillion Btu |
| 01 April, 1974 | 98.302 | -3.212 | Trillion Btu |
| 01 May, 1974 | 101.573 | + 3.271 | Trillion Btu |
| 01 June, 1974 | 98.183 | -3.39 | Trillion Btu |
| 01 July, 1974 | 101.109 | + 2.926 | Trillion Btu |
| 01 August, 1974 | 100.95 | -0.15899999999999 | Trillion Btu |
| 01 September, 1974 | 97.656 | -3.294 | Trillion Btu |
| 01 October, 1974 | 100.712 | + 3.056 | Trillion Btu |
| 01 November, 1974 | 97.631 | -3.081 | Trillion Btu |
| 01 December, 1974 | 101.285 | + 3.654 | Trillion Btu |
| 01 January, 1975 | 93.407 | -7.878 | Trillion Btu |
| 01 February, 1975 | 84.327 | -9.08 | Trillion Btu |
| 01 March, 1975 | 93.21 | + 8.883 | Trillion Btu |
| 01 April, 1975 | 90.286 | -2.924 | Trillion Btu |
| 01 May, 1975 | 93.424 | + 3.138 | Trillion Btu |
| 01 June, 1975 | 90.254 | -3.17 | Trillion Btu |
| 01 July, 1975 | 92.809 | + 2.555 | Trillion Btu |
| 01 August, 1975 | 92.56 | -0.249 | Trillion Btu |
| 01 September, 1975 | 89.661 | -2.899 | Trillion Btu |
| 01 October, 1975 | 92.793 | + 3.132 | Trillion Btu |
| 01 November, 1975 | 89.888 | -2.905 | Trillion Btu |
| 01 December, 1975 | 92.973 | + 3.085 | Trillion Btu |
| 01 January, 1976 | 106.223 | + 13.25 | Trillion Btu |
| 01 February, 1976 | 99.583 | -6.64 | Trillion Btu |
| 01 March, 1976 | 106.355 | + 6.772 | Trillion Btu |
| 01 April, 1976 | 103.102 | -3.253 | Trillion Btu |
| 01 May, 1976 | 106.376 | + 3.274 | Trillion Btu |
| 01 June, 1976 | 102.914 | -3.462 | Trillion Btu |
| 01 July, 1976 | 105.989 | + 3.075 | Trillion Btu |
| 01 August, 1976 | 105.763 | -0.226 | Trillion Btu |
| 01 September, 1976 | 102.088 | -3.675 | Trillion Btu |
| 01 October, 1976 | 106.055 | + 3.967 | Trillion Btu |
| 01 November, 1976 | 102.703 | -3.352 | Trillion Btu |
| 01 December, 1976 | 106.097 | + 3.394 | Trillion Btu |
| 01 January, 1977 | 111.879 | + 5.782 | Trillion Btu |
| 01 February, 1977 | 100.527 | -11.352 | Trillion Btu |
| 01 March, 1977 | 111.746 | + 11.219 | Trillion Btu |
| 01 April, 1977 | 108.064 | -3.682 | Trillion Btu |
| 01 May, 1977 | 111.58 | + 3.516 | Trillion Btu |
| 01 June, 1977 | 107.855 | -3.725 | Trillion Btu |
| 01 July, 1977 | 111.302 | + 3.447 | Trillion Btu |
| 01 August, 1977 | 111.289 | -0.013000000000005 | Trillion Btu |
| 01 September, 1977 | 107.736 | -3.553 | Trillion Btu |
| 01 October, 1977 | 111.36 | + 3.624 | Trillion Btu |
| 01 November, 1977 | 108.324 | -3.036 | Trillion Btu |
| 01 December, 1977 | 112.183 | + 3.859 | Trillion Btu |
| 01 January, 1978 | 121.761 | + 9.578 | Trillion Btu |
| 01 February, 1978 | 109.93 | -11.831 | Trillion Btu |
| 01 March, 1978 | 121.712 | + 11.782 | Trillion Btu |
| 01 April, 1978 | 117.952 | -3.76 | Trillion Btu |
| 01 May, 1978 | 122.177 | + 4.225 | Trillion Btu |
| 01 June, 1978 | 117.931 | -4.246 | Trillion Btu |
| 01 July, 1978 | 121.692 | + 3.761 | Trillion Btu |
| 01 August, 1978 | 121.437 | -0.255 | Trillion Btu |
| 01 September, 1978 | 117.487 | -3.95 | Trillion Btu |
| 01 October, 1978 | 121.133 | + 3.646 | Trillion Btu |
| 01 November, 1978 | 117.349 | -3.784 | Trillion Btu |
| 01 December, 1978 | 121.426 | + 4.077 | Trillion Btu |
| 01 January, 1979 | 122.366 | + 0.94 | Trillion Btu |
| 01 February, 1979 | 110.363 | -12.003 | Trillion Btu |
| 01 March, 1979 | 122.476 | + 12.113 | Trillion Btu |
| 01 April, 1979 | 118.562 | -3.914 | Trillion Btu |
| 01 May, 1979 | 122.844 | + 4.282 | Trillion Btu |
| 01 June, 1979 | 118.512 | -4.332 | Trillion Btu |
| 01 July, 1979 | 122.091 | + 3.579 | Trillion Btu |
| 01 August, 1979 | 121.908 | -0.18299999999999 | Trillion Btu |
| 01 September, 1979 | 117.781 | -4.127 | Trillion Btu |
| 01 October, 1979 | 121.775 | + 3.994 | Trillion Btu |
| 01 November, 1979 | 118.194 | -3.581 | Trillion Btu |
| 01 December, 1979 | 122.087 | + 3.893 | Trillion Btu |
| 01 January, 1980 | 138.549 | + 16.462 | Trillion Btu |
| 01 February, 1980 | 129.336 | -9.213 | Trillion Btu |
| 01 March, 1980 | 138.433 | + 9.097 | Trillion Btu |
| 01 April, 1980 | 134.231 | -4.202 | Trillion Btu |
| 01 May, 1980 | 138.976 | + 4.745 | Trillion Btu |
| 01 June, 1980 | 134.46 | -4.516 | Trillion Btu |
| 01 July, 1980 | 138.443 | + 3.983 | Trillion Btu |
| 01 August, 1980 | 137.971 | -0.47200000000001 | Trillion Btu |
| 01 September, 1980 | 133.362 | -4.609 | Trillion Btu |
| 01 October, 1980 | 137.659 | + 4.297 | Trillion Btu |
| 01 November, 1980 | 133.449 | -4.21 | Trillion Btu |
| 01 December, 1980 | 137.97 | + 4.521 | Trillion Btu |
| 01 January, 1981 | 146.979 | + 9.009 | Trillion Btu |
| 01 February, 1981 | 132.578 | -14.401 | Trillion Btu |
| 01 March, 1981 | 146.863 | + 14.285 | Trillion Btu |
| 01 April, 1981 | 142.39 | -4.473 | Trillion Btu |
| 01 May, 1981 | 147.409 | + 5.019 | Trillion Btu |
| 01 June, 1981 | 142.62 | -4.789 | Trillion Btu |
| 01 July, 1981 | 146.873 | + 4.253 | Trillion Btu |
| 01 August, 1981 | 146.398 | -0.47499999999999 | Trillion Btu |
| 01 September, 1981 | 141.516 | -4.882 | Trillion Btu |
| 01 October, 1981 | 146.083 | + 4.567 | Trillion Btu |
| 01 November, 1981 | 141.603 | -4.48 | Trillion Btu |
| 01 December, 1981 | 146.396 | + 4.793 | Trillion Btu |
| 01 January, 1982 | 143.159 | -3.237 | Trillion Btu |
| 01 February, 1982 | 129.127 | -14.032 | Trillion Btu |
| 01 March, 1982 | 143.042 | + 13.915 | Trillion Btu |
| 01 April, 1982 | 138.693 | -4.349 | Trillion Btu |
| 01 May, 1982 | 143.589 | + 4.896 | Trillion Btu |
| 01 June, 1982 | 138.923 | -4.666 | Trillion Btu |
| 01 July, 1982 | 143.053 | + 4.13 | Trillion Btu |
| 01 August, 1982 | 142.578 | -0.47499999999999 | Trillion Btu |
| 01 September, 1982 | 137.819 | -4.759 | Trillion Btu |
| 01 October, 1982 | 142.263 | + 4.444 | Trillion Btu |
| 01 November, 1982 | 137.906 | -4.357 | Trillion Btu |
| 01 December, 1982 | 142.576 | + 4.67 | Trillion Btu |
| 01 January, 1983 | 162.267 | + 19.691 | Trillion Btu |
| 01 February, 1983 | 146.385 | -15.882 | Trillion Btu |
| 01 March, 1983 | 162.149 | + 15.764 | Trillion Btu |
| 01 April, 1983 | 157.185 | -4.964 | Trillion Btu |
| 01 May, 1983 | 162.699 | + 5.514 | Trillion Btu |
| 01 June, 1983 | 157.417 | -5.282 | Trillion Btu |
| 01 July, 1983 | 162.16 | + 4.743 | Trillion Btu |
| 01 August, 1983 | 161.682 | -0.47800000000001 | Trillion Btu |
| 01 September, 1983 | 156.306 | -5.376 | Trillion Btu |
| 01 October, 1983 | 161.365 | + 5.059 | Trillion Btu |
| 01 November, 1983 | 156.394 | -4.971 | Trillion Btu |
| 01 December, 1983 | 161.68 | + 5.286 | Trillion Btu |
| 01 January, 1984 | 165.52 | + 3.84 | Trillion Btu |
| 01 February, 1984 | 154.566 | -10.954 | Trillion Btu |
| 01 March, 1984 | 165.404 | + 10.838 | Trillion Btu |
| 01 April, 1984 | 160.332 | -5.072 | Trillion Btu |
| 01 May, 1984 | 165.949 | + 5.617 | Trillion Btu |
| 01 June, 1984 | 160.562 | -5.387 | Trillion Btu |
| 01 July, 1984 | 165.414 | + 4.852 | Trillion Btu |
| 01 August, 1984 | 164.939 | -0.47499999999999 | Trillion Btu |
| 01 September, 1984 | 159.459 | -5.48 | Trillion Btu |
| 01 October, 1984 | 164.625 | + 5.166 | Trillion Btu |
| 01 November, 1984 | 159.547 | -5.078 | Trillion Btu |
| 01 December, 1984 | 164.938 | + 5.391 | Trillion Btu |
| 01 January, 1985 | 165.918 | + 0.98000000000002 | Trillion Btu |
| 01 February, 1985 | 149.684 | -16.234 | Trillion Btu |
| 01 March, 1985 | 165.801 | + 16.117 | Trillion Btu |
| 01 April, 1985 | 160.718 | -5.083 | Trillion Btu |
| 01 May, 1985 | 166.347 | + 5.629 | Trillion Btu |
| 01 June, 1985 | 160.948 | -5.399 | Trillion Btu |
| 01 July, 1985 | 165.812 | + 4.864 | Trillion Btu |
| 01 August, 1985 | 165.337 | -0.47500000000002 | Trillion Btu |
| 01 September, 1985 | 159.844 | -5.493 | Trillion Btu |
| 01 October, 1985 | 165.023 | + 5.179 | Trillion Btu |
| 01 November, 1985 | 159.931 | -5.092 | Trillion Btu |
| 01 December, 1985 | 165.336 | + 5.405 | Trillion Btu |
| 01 January, 1986 | 165.682 | + 0.34599999999998 | Trillion Btu |
| 01 February, 1986 | 149.471 | -16.211 | Trillion Btu |
| 01 March, 1986 | 165.566 | + 16.095 | Trillion Btu |
| 01 April, 1986 | 160.49 | -5.076 | Trillion Btu |
| 01 May, 1986 | 166.112 | + 5.622 | Trillion Btu |
| 01 June, 1986 | 160.72 | -5.392 | Trillion Btu |
| 01 July, 1986 | 165.576 | + 4.856 | Trillion Btu |
| 01 August, 1986 | 165.101 | -0.47499999999999 | Trillion Btu |
| 01 September, 1986 | 159.616 | -5.485 | Trillion Btu |
| 01 October, 1986 | 164.787 | + 5.171 | Trillion Btu |
| 01 November, 1986 | 159.703 | -5.084 | Trillion Btu |
| 01 December, 1986 | 165.1 | + 5.397 | Trillion Btu |
| 01 January, 1987 | 165.587 | + 0.48699999999999 | Trillion Btu |
| 01 February, 1987 | 149.386 | -16.201 | Trillion Btu |
| 01 March, 1987 | 165.471 | + 16.085 | Trillion Btu |
| 01 April, 1987 | 160.398 | -5.073 | Trillion Btu |
| 01 May, 1987 | 166.016 | + 5.618 | Trillion Btu |
| 01 June, 1987 | 160.627 | -5.389 | Trillion Btu |
| 01 July, 1987 | 165.482 | + 4.855 | Trillion Btu |
| 01 August, 1987 | 165.008 | -0.47399999999999 | Trillion Btu |
| 01 September, 1987 | 159.526 | -5.482 | Trillion Btu |
| 01 October, 1987 | 164.695 | + 5.169 | Trillion Btu |
| 01 November, 1987 | 159.614 | -5.081 | Trillion Btu |
| 01 December, 1987 | 165.007 | + 5.393 | Trillion Btu |
| 01 January, 1988 | 171.487 | + 6.48 | Trillion Btu |
| 01 February, 1988 | 160.151 | -11.336 | Trillion Btu |
| 01 March, 1988 | 171.372 | + 11.221 | Trillion Btu |
| 01 April, 1988 | 166.105 | -5.267 | Trillion Btu |
| 01 May, 1988 | 171.911 | + 5.806 | Trillion Btu |
| 01 June, 1988 | 166.333 | -5.578 | Trillion Btu |
| 01 July, 1988 | 171.382 | + 5.049 | Trillion Btu |
| 01 August, 1988 | 170.913 | -0.46899999999999 | Trillion Btu |
| 01 September, 1988 | 165.242 | -5.671 | Trillion Btu |
| 01 October, 1988 | 170.602 | + 5.36 | Trillion Btu |
| 01 November, 1988 | 165.328 | -5.274 | Trillion Btu |
| 01 December, 1988 | 170.911 | + 5.583 | Trillion Btu |
| 01 January, 1989 | 160.986 | -9.925 | Trillion Btu |
| 01 February, 1989 | 147.729 | -13.257 | Trillion Btu |
| 01 March, 1989 | 165.387 | + 17.658 | Trillion Btu |
| 01 April, 1989 | 151.205 | -14.182 | Trillion Btu |
| 01 May, 1989 | 135.241 | -15.964 | Trillion Btu |
| 01 June, 1989 | 143.687 | + 8.446 | Trillion Btu |
| 01 July, 1989 | 150.33 | + 6.643 | Trillion Btu |
| 01 August, 1989 | 164.913 | + 14.583 | Trillion Btu |
| 01 September, 1989 | 154.585 | -10.328 | Trillion Btu |
| 01 October, 1989 | 162.224 | + 7.639 | Trillion Btu |
| 01 November, 1989 | 165.021 | + 2.797 | Trillion Btu |
| 01 December, 1989 | 169.675 | + 4.654 | Trillion Btu |
| 01 January, 1990 | 150.299 | -19.376 | Trillion Btu |
| 01 February, 1990 | 146.946 | -3.353 | Trillion Btu |
| 01 March, 1990 | 156.526 | + 9.58 | Trillion Btu |
| 01 April, 1990 | 148.539 | -7.987 | Trillion Btu |
| 01 May, 1990 | 126.858 | -21.681 | Trillion Btu |
| 01 June, 1990 | 99.489 | -27.369 | Trillion Btu |
| 01 July, 1990 | 135.269 | + 35.78 | Trillion Btu |
| 01 August, 1990 | 157.41 | + 22.141 | Trillion Btu |
| 01 September, 1990 | 153.174 | -4.236 | Trillion Btu |
| 01 October, 1990 | 147.384 | -5.79 | Trillion Btu |
| 01 November, 1990 | 136.756 | -10.628 | Trillion Btu |
| 01 December, 1990 | 158.423 | + 21.667 | Trillion Btu |
| 01 January, 1991 | 173.335 | + 14.912 | Trillion Btu |
| 01 February, 1991 | 121.797 | -51.538 | Trillion Btu |
| 01 March, 1991 | 123.442 | + 1.645 | Trillion Btu |
| 01 April, 1991 | 103.482 | -19.96 | Trillion Btu |
| 01 May, 1991 | 115.425 | + 11.943 | Trillion Btu |
| 01 June, 1991 | 120.872 | + 5.447 | Trillion Btu |
| 01 July, 1991 | 120.733 | -0.139 | Trillion Btu |
| 01 August, 1991 | 155.291 | + 34.558 | Trillion Btu |
| 01 September, 1991 | 172.709 | + 17.418 | Trillion Btu |
| 01 October, 1991 | 156.422 | -16.287 | Trillion Btu |
| 01 November, 1991 | 148.873 | -7.549 | Trillion Btu |
| 01 December, 1991 | 171.425 | + 22.552 | Trillion Btu |
| 01 January, 1992 | 173.577 | + 2.152 | Trillion Btu |
| 01 February, 1992 | 134.054 | -39.523 | Trillion Btu |
| 01 March, 1992 | 123.756 | -10.298 | Trillion Btu |
| 01 April, 1992 | 117.866 | -5.89 | Trillion Btu |
| 01 May, 1992 | 94.633 | -23.233 | Trillion Btu |
| 01 June, 1992 | 133.392 | + 38.759 | Trillion Btu |
| 01 July, 1992 | 147.482 | + 14.09 | Trillion Btu |
| 01 August, 1992 | 165.082 | + 17.6 | Trillion Btu |
| 01 September, 1992 | 150.986 | -14.096 | Trillion Btu |
| 01 October, 1992 | 167.03 | + 16.044 | Trillion Btu |
| 01 November, 1992 | 169.158 | + 2.128 | Trillion Btu |
| 01 December, 1992 | 160.274 | -8.884 | Trillion Btu |
| 01 January, 1993 | 170.295 | + 10.021 | Trillion Btu |
| 01 February, 1993 | 151.315 | -18.98 | Trillion Btu |
| 01 March, 1993 | 160.864 | + 9.549 | Trillion Btu |
| 01 April, 1993 | 137.561 | -23.303 | Trillion Btu |
| 01 May, 1993 | 106.254 | -31.307 | Trillion Btu |
| 01 June, 1993 | 108.469 | + 2.215 | Trillion Btu |
| 01 July, 1993 | 121.229 | + 12.76 | Trillion Btu |
| 01 August, 1993 | 169.12 | + 47.891 | Trillion Btu |
| 01 September, 1993 | 155.357 | -13.763 | Trillion Btu |
| 01 October, 1993 | 159.726 | + 4.369 | Trillion Btu |
| 01 November, 1993 | 166.642 | + 6.916 | Trillion Btu |
| 01 December, 1993 | 165.924 | -0.71799999999999 | Trillion Btu |
| 01 January, 1994 | 212.491 | + 46.567 | Trillion Btu |
| 01 February, 1994 | 161.265 | -51.226 | Trillion Btu |
| 01 March, 1994 | 168.55 | + 7.285 | Trillion Btu |
| 01 April, 1994 | 150.964 | -17.586 | Trillion Btu |
| 01 May, 1994 | 114.515 | -36.449 | Trillion Btu |
| 01 June, 1994 | 128.347 | + 13.832 | Trillion Btu |
| 01 July, 1994 | 180.25 | + 51.903 | Trillion Btu |
| 01 August, 1994 | 159.274 | -20.976 | Trillion Btu |
| 01 September, 1994 | 149.032 | -10.242 | Trillion Btu |
| 01 October, 1994 | 173.729 | + 24.697 | Trillion Btu |
| 01 November, 1994 | 166.057 | -7.672 | Trillion Btu |
| 01 December, 1994 | 162.956 | -3.101 | Trillion Btu |
| 01 January, 1995 | 151.629 | -11.327 | Trillion Btu |
| 01 February, 1995 | 126.223 | -25.406 | Trillion Btu |
| 01 March, 1995 | 152.077 | + 25.854 | Trillion Btu |
| 01 April, 1995 | 171.251 | + 19.174 | Trillion Btu |
| 01 May, 1995 | 144.473 | -26.778 | Trillion Btu |
| 01 June, 1995 | 137.729 | -6.744 | Trillion Btu |
| 01 July, 1995 | 198.459 | + 60.73 | Trillion Btu |
| 01 August, 1995 | 203.418 | + 4.959 | Trillion Btu |
| 01 September, 1995 | 174.624 | -28.794 | Trillion Btu |
| 01 October, 1995 | 192.393 | + 17.769 | Trillion Btu |
| 01 November, 1995 | 171.79 | -20.603 | Trillion Btu |
| 01 December, 1995 | 167.971 | -3.819 | Trillion Btu |
| 01 January, 1996 | 181.486 | + 13.515 | Trillion Btu |
| 01 February, 1996 | 141.113 | -40.373 | Trillion Btu |
| 01 March, 1996 | 164.997 | + 23.884 | Trillion Btu |
| 01 April, 1996 | 122.039 | -42.958 | Trillion Btu |
| 01 May, 1996 | 144.57 | + 22.531 | Trillion Btu |
| 01 June, 1996 | 163.161 | + 18.591 | Trillion Btu |
| 01 July, 1996 | 183.704 | + 20.543 | Trillion Btu |
| 01 August, 1996 | 201.478 | + 17.774 | Trillion Btu |
| 01 September, 1996 | 166.07 | -35.408 | Trillion Btu |
| 01 October, 1996 | 203.966 | + 37.896 | Trillion Btu |
| 01 November, 1996 | 194.748 | -9.218 | Trillion Btu |
| 01 December, 1996 | 165.456 | -29.292 | Trillion Btu |
| 01 January, 1997 | 190.431 | + 24.975 | Trillion Btu |
| 01 February, 1997 | 147.525 | -42.906 | Trillion Btu |
| 01 March, 1997 | 166.116 | + 18.591 | Trillion Btu |
| 01 April, 1997 | 164.812 | -1.304 | Trillion Btu |
| 01 May, 1997 | 176.13 | + 11.318 | Trillion Btu |
| 01 June, 1997 | 149.182 | -26.948 | Trillion Btu |
| 01 July, 1997 | 170.461 | + 21.279 | Trillion Btu |
| 01 August, 1997 | 175.421 | + 4.96 | Trillion Btu |
| 01 September, 1997 | 166.348 | -9.073 | Trillion Btu |
| 01 October, 1997 | 209.299 | + 42.951 | Trillion Btu |
| 01 November, 1997 | 176.086 | -33.213 | Trillion Btu |
| 01 December, 1997 | 165.438 | -10.648 | Trillion Btu |
| 01 January, 1998 | 193.759 | + 28.321 | Trillion Btu |
| 01 February, 1998 | 139.793 | -53.966 | Trillion Btu |
| 01 March, 1998 | 158.386 | + 18.593 | Trillion Btu |
| 01 April, 1998 | 158.004 | -0.38200000000001 | Trillion Btu |
| 01 May, 1998 | 165.054 | + 7.05 | Trillion Btu |
| 01 June, 1998 | 113.331 | -51.723 | Trillion Btu |
| 01 July, 1998 | 162.537 | + 49.206 | Trillion Btu |
| 01 August, 1998 | 168.693 | + 6.156 | Trillion Btu |
| 01 September, 1998 | 164.114 | -4.579 | Trillion Btu |
| 01 October, 1998 | 177.664 | + 13.55 | Trillion Btu |
| 01 November, 1998 | 150.264 | -27.4 | Trillion Btu |
| 01 December, 1998 | 177.73 | + 27.466 | Trillion Btu |
| 01 January, 1999 | 185.479 | + 7.749 | Trillion Btu |
| 01 February, 1999 | 142.074 | -43.405 | Trillion Btu |
| 01 March, 1999 | 130.626 | -11.448 | Trillion Btu |
| 01 April, 1999 | 161.532 | + 30.906 | Trillion Btu |
| 01 May, 1999 | 195.246 | + 33.714 | Trillion Btu |
| 01 June, 1999 | 151.388 | -43.858 | Trillion Btu |
| 01 July, 1999 | 177.397 | + 26.009 | Trillion Btu |
| 01 August, 1999 | 172.298 | -5.099 | Trillion Btu |
| 01 September, 1999 | 158.324 | -13.974 | Trillion Btu |
| 01 October, 1999 | 142.489 | -15.835 | Trillion Btu |
| 01 November, 1999 | 167.698 | + 25.209 | Trillion Btu |
| 01 December, 1999 | 149.846 | -17.852 | Trillion Btu |
| 01 January, 2000 | 135.51 | -14.336 | Trillion Btu |
| 01 February, 2000 | 158.422 | + 22.912 | Trillion Btu |
| 01 March, 2000 | 167.882 | + 9.46 | Trillion Btu |
| 01 April, 2000 | 161.33 | -6.552 | Trillion Btu |
| 01 May, 2000 | 157.876 | -3.454 | Trillion Btu |
| 01 June, 2000 | 141.929 | -15.947 | Trillion Btu |
| 01 July, 2000 | 163.344 | + 21.415 | Trillion Btu |
| 01 August, 2000 | 164.938 | + 1.594 | Trillion Btu |
| 01 September, 2000 | 152.895 | -12.043 | Trillion Btu |
| 01 October, 2000 | 175.97 | + 23.075 | Trillion Btu |
| 01 November, 2000 | 171.67 | -4.3 | Trillion Btu |
| 01 December, 2000 | 176.435 | + 4.765 | Trillion Btu |
| 01 January, 2001 | 151.057 | -25.378 | Trillion Btu |
| 01 February, 2001 | 133.94 | -17.117 | Trillion Btu |
| 01 March, 2001 | 144.513 | + 10.573 | Trillion Btu |
| 01 April, 2001 | 141.491 | -3.022 | Trillion Btu |
| 01 May, 2001 | 136.675 | -4.816 | Trillion Btu |
| 01 June, 2001 | 138.207 | + 1.532 | Trillion Btu |
| 01 July, 2001 | 143.246 | + 5.039 | Trillion Btu |
| 01 August, 2001 | 147.835 | + 4.589 | Trillion Btu |
| 01 September, 2001 | 139.471 | -8.364 | Trillion Btu |
| 01 October, 2001 | 150.558 | + 11.087 | Trillion Btu |
| 01 November, 2001 | 144.633 | -5.925 | Trillion Btu |
| 01 December, 2001 | 147.221 | + 2.588 | Trillion Btu |
| 01 January, 2002 | 145.798 | -1.423 | Trillion Btu |
| 01 February, 2002 | 127.528 | -18.27 | Trillion Btu |
| 01 March, 2002 | 134.923 | + 7.395 | Trillion Btu |
| 01 April, 2002 | 135.442 | + 0.51900000000001 | Trillion Btu |
| 01 May, 2002 | 144.167 | + 8.725 | Trillion Btu |
| 01 June, 2002 | 134.931 | -9.236 | Trillion Btu |
| 01 July, 2002 | 150.918 | + 15.987 | Trillion Btu |
| 01 August, 2002 | 138.39 | -12.528 | Trillion Btu |
| 01 September, 2002 | 146.337 | + 7.947 | Trillion Btu |
| 01 October, 2002 | 158.714 | + 12.377 | Trillion Btu |
| 01 November, 2002 | 147.423 | -11.291 | Trillion Btu |
| 01 December, 2002 | 155.293 | + 7.87 | Trillion Btu |
| 01 January, 2003 | 144.575 | -10.718 | Trillion Btu |
| 01 February, 2003 | 131.405 | -13.17 | Trillion Btu |
| 01 March, 2003 | 143.02 | + 11.615 | Trillion Btu |
| 01 April, 2003 | 140.603 | -2.417 | Trillion Btu |
| 01 May, 2003 | 141.935 | + 1.332 | Trillion Btu |
| 01 June, 2003 | 139.906 | -2.029 | Trillion Btu |
| 01 July, 2003 | 149.438 | + 9.532 | Trillion Btu |
| 01 August, 2003 | 146.538 | -2.9 | Trillion Btu |
| 01 September, 2003 | 141.261 | -5.277 | Trillion Btu |
| 01 October, 2003 | 146.01 | + 4.749 | Trillion Btu |
| 01 November, 2003 | 143.74 | -2.27 | Trillion Btu |
| 01 December, 2003 | 156.148 | + 12.408 | Trillion Btu |
| 01 January, 2004 | 160.384 | + 4.236 | Trillion Btu |
| 01 February, 2004 | 146.759 | -13.625 | Trillion Btu |
| 01 March, 2004 | 152.449 | + 5.69 | Trillion Btu |
| 01 April, 2004 | 154.84 | + 2.391 | Trillion Btu |
| 01 May, 2004 | 148.129 | -6.711 | Trillion Btu |
| 01 June, 2004 | 150.239 | + 2.11 | Trillion Btu |
| 01 July, 2004 | 157.616 | + 7.377 | Trillion Btu |
| 01 August, 2004 | 155.679 | -1.937 | Trillion Btu |
| 01 September, 2004 | 149.482 | -6.197 | Trillion Btu |
| 01 October, 2004 | 157.705 | + 8.223 | Trillion Btu |
| 01 November, 2004 | 152.862 | -4.843 | Trillion Btu |
| 01 December, 2004 | 165.435 | + 12.573 | Trillion Btu |
| 01 January, 2005 | 162.518 | -2.917 | Trillion Btu |
| 01 February, 2005 | 153.759 | -8.759 | Trillion Btu |
| 01 March, 2005 | 156.994 | + 3.235 | Trillion Btu |
| 01 April, 2005 | 151.019 | -5.975 | Trillion Btu |
| 01 May, 2005 | 154.153 | + 3.134 | Trillion Btu |
| 01 June, 2005 | 151.586 | -2.567 | Trillion Btu |
| 01 July, 2005 | 159.215 | + 7.629 | Trillion Btu |
| 01 August, 2005 | 158.659 | -0.55600000000001 | Trillion Btu |
| 01 September, 2005 | 152.808 | -5.851 | Trillion Btu |
| 01 October, 2005 | 157.214 | + 4.406 | Trillion Btu |
| 01 November, 2005 | 152.53 | -4.684 | Trillion Btu |
| 01 December, 2005 | 160.295 | + 7.765 | Trillion Btu |
| 01 January, 2006 | 170.915 | + 10.62 | Trillion Btu |
| 01 February, 2006 | 149.648 | -21.267 | Trillion Btu |
| 01 March, 2006 | 158.205 | + 8.557 | Trillion Btu |
| 01 April, 2006 | 152.179 | -6.026 | Trillion Btu |
| 01 May, 2006 | 156.032 | + 3.853 | Trillion Btu |
| 01 June, 2006 | 155.271 | -0.76100000000002 | Trillion Btu |
| 01 July, 2006 | 164.518 | + 9.247 | Trillion Btu |
| 01 August, 2006 | 163.552 | -0.96600000000001 | Trillion Btu |
| 01 September, 2006 | 159.264 | -4.288 | Trillion Btu |
| 01 October, 2006 | 165.145 | + 5.881 | Trillion Btu |
| 01 November, 2006 | 162.144 | -3.001 | Trillion Btu |
| 01 December, 2006 | 168.863 | + 6.719 | Trillion Btu |
| 01 January, 2007 | 166.364 | -2.499 | Trillion Btu |
| 01 February, 2007 | 151.614 | -14.75 | Trillion Btu |
| 01 March, 2007 | 163.862 | + 12.248 | Trillion Btu |
| 01 April, 2007 | 160.712 | -3.15 | Trillion Btu |
| 01 May, 2007 | 162.222 | + 1.51 | Trillion Btu |
| 01 June, 2007 | 158.019 | -4.203 | Trillion Btu |
| 01 July, 2007 | 165.408 | + 7.389 | Trillion Btu |
| 01 August, 2007 | 163.064 | -2.344 | Trillion Btu |
| 01 September, 2007 | 158.665 | -4.399 | Trillion Btu |
| 01 October, 2007 | 166.726 | + 8.061 | Trillion Btu |
| 01 November, 2007 | 165.898 | -0.828 | Trillion Btu |
| 01 December, 2007 | 175.413 | + 9.515 | Trillion Btu |
| 01 January, 2008 | 186.135 | + 10.722 | Trillion Btu |
| 01 February, 2008 | 163.637 | -22.498 | Trillion Btu |
| 01 March, 2008 | 170.853 | + 7.216 | Trillion Btu |
| 01 April, 2008 | 169.161 | -1.692 | Trillion Btu |
| 01 May, 2008 | 172.651 | + 3.49 | Trillion Btu |
| 01 June, 2008 | 163.773 | -8.878 | Trillion Btu |
| 01 July, 2008 | 170.695 | + 6.922 | Trillion Btu |
| 01 August, 2008 | 170.751 | + 0.056000000000012 | Trillion Btu |
| 01 September, 2008 | 163.165 | -7.586 | Trillion Btu |
| 01 October, 2008 | 171.863 | + 8.698 | Trillion Btu |
| 01 November, 2008 | 168.827 | -3.036 | Trillion Btu |
| 01 December, 2008 | 163.614 | -5.213 | Trillion Btu |
| 01 January, 2009 | 158.795 | -4.819 | Trillion Btu |
| 01 February, 2009 | 148.396 | -10.399 | Trillion Btu |
| 01 March, 2009 | 159.598 | + 11.202 | Trillion Btu |
| 01 April, 2009 | 152.401 | -7.197 | Trillion Btu |
| 01 May, 2009 | 159.05 | + 6.649 | Trillion Btu |
| 01 June, 2009 | 159.591 | + 0.541 | Trillion Btu |
| 01 July, 2009 | 170.649 | + 11.058 | Trillion Btu |
| 01 August, 2009 | 174.06 | + 3.411 | Trillion Btu |
| 01 September, 2009 | 165.765 | -8.295 | Trillion Btu |
| 01 October, 2009 | 173.933 | + 8.168 | Trillion Btu |
| 01 November, 2009 | 172.441 | -1.492 | Trillion Btu |
| 01 December, 2009 | 177.768 | + 5.327 | Trillion Btu |
| 01 January, 2010 | 194.785 | + 17.017 | Trillion Btu |
| 01 February, 2010 | 179.413 | -15.372 | Trillion Btu |
| 01 March, 2010 | 197.785 | + 18.372 | Trillion Btu |
| 01 April, 2010 | 190.466 | -7.319 | Trillion Btu |
| 01 May, 2010 | 193.021 | + 2.555 | Trillion Btu |
| 01 June, 2010 | 191.139 | -1.882 | Trillion Btu |
| 01 July, 2010 | 197.776 | + 6.637 | Trillion Btu |
| 01 August, 2010 | 199.176 | + 1.4 | Trillion Btu |
| 01 September, 2010 | 194.227 | -4.949 | Trillion Btu |
| 01 October, 2010 | 199.827 | + 5.6 | Trillion Btu |
| 01 November, 2010 | 198.872 | -0.95499999999998 | Trillion Btu |
| 01 December, 2010 | 206.987 | + 8.115 | Trillion Btu |
| 01 January, 2011 | 209.042 | + 2.055 | Trillion Btu |
| 01 February, 2011 | 186.355 | -22.687 | Trillion Btu |
| 01 March, 2011 | 203.086 | + 16.731 | Trillion Btu |
| 01 April, 2011 | 192.144 | -10.942 | Trillion Btu |
| 01 May, 2011 | 194.716 | + 2.572 | Trillion Btu |
| 01 June, 2011 | 198.315 | + 3.599 | Trillion Btu |
| 01 July, 2011 | 201.189 | + 2.874 | Trillion Btu |
| 01 August, 2011 | 202.272 | + 1.083 | Trillion Btu |
| 01 September, 2011 | 196.367 | -5.905 | Trillion Btu |
| 01 October, 2011 | 200.42 | + 4.053 | Trillion Btu |
| 01 November, 2011 | 203.727 | + 3.307 | Trillion Btu |
| 01 December, 2011 | 213.257 | + 9.53 | Trillion Btu |
| 01 January, 2012 | 208.872 | -4.385 | Trillion Btu |
| 01 February, 2012 | 195.373 | -13.499 | Trillion Btu |
| 01 March, 2012 | 200.899 | + 5.526 | Trillion Btu |
| 01 April, 2012 | 191.354 | -9.545 | Trillion Btu |
| 01 May, 2012 | 200.614 | + 9.26 | Trillion Btu |
| 01 June, 2012 | 195.076 | -5.538 | Trillion Btu |
| 01 July, 2012 | 197.451 | + 2.375 | Trillion Btu |
| 01 August, 2012 | 200.798 | + 3.347 | Trillion Btu |
| 01 September, 2012 | 193.007 | -7.791 | Trillion Btu |
| 01 October, 2012 | 197.909 | + 4.902 | Trillion Btu |
| 01 November, 2012 | 197.209 | -0.69999999999999 | Trillion Btu |
| 01 December, 2012 | 204.117 | + 6.908 | Trillion Btu |
| 01 January, 2013 | 204.411 | + 0.29400000000001 | Trillion Btu |
| 01 February, 2013 | 185.058 | -19.353 | Trillion Btu |
| 01 March, 2013 | 202.865 | + 17.807 | Trillion Btu |
| 01 April, 2013 | 197.366 | -5.499 | Trillion Btu |
| 01 May, 2013 | 205.421 | + 8.055 | Trillion Btu |
| 01 June, 2013 | 203.855 | -1.566 | Trillion Btu |
| 01 July, 2013 | 213.432 | + 9.577 | Trillion Btu |
| 01 August, 2013 | 207.521 | -5.911 | Trillion Btu |
| 01 September, 2013 | 196.728 | -10.793 | Trillion Btu |
| 01 October, 2013 | 207.317 | + 10.589 | Trillion Btu |
| 01 November, 2013 | 207.26 | -0.057000000000016 | Trillion Btu |
| 01 December, 2013 | 218.053 | + 10.793 | Trillion Btu |
| 01 January, 2014 | 209.709 | -8.344 | Trillion Btu |
| 01 February, 2014 | 189.844 | -19.865 | Trillion Btu |
| 01 March, 2014 | 208.594 | + 18.75 | Trillion Btu |
| 01 April, 2014 | 203.374 | -5.22 | Trillion Btu |
| 01 May, 2014 | 206.705 | + 3.331 | Trillion Btu |
| 01 June, 2014 | 206.743 | + 0.037999999999982 | Trillion Btu |
| 01 July, 2014 | 213.252 | + 6.509 | Trillion Btu |
| 01 August, 2014 | 212.053 | -1.199 | Trillion Btu |
| 01 September, 2014 | 200.73 | -11.323 | Trillion Btu |
| 01 October, 2014 | 208.451 | + 7.721 | Trillion Btu |
| 01 November, 2014 | 206.005 | -2.446 | Trillion Btu |
| 01 December, 2014 | 218.733 | + 12.728 | Trillion Btu |
| 01 January, 2015 | 215.448 | -3.285 | Trillion Btu |
| 01 February, 2015 | 193.059 | -22.389 | Trillion Btu |
| 01 March, 2015 | 207.357 | + 14.298 | Trillion Btu |
| 01 April, 2015 | 202.745 | -4.612 | Trillion Btu |
| 01 May, 2015 | 209.795 | + 7.05 | Trillion Btu |
| 01 June, 2015 | 205.794 | -4.001 | Trillion Btu |
| 01 July, 2015 | 213.177 | + 7.383 | Trillion Btu |
| 01 August, 2015 | 211.704 | -1.473 | Trillion Btu |
| 01 September, 2015 | 202.523 | -9.181 | Trillion Btu |
| 01 October, 2015 | 206.956 | + 4.433 | Trillion Btu |
| 01 November, 2015 | 207.313 | + 0.357 | Trillion Btu |
| 01 December, 2015 | 215.484 | + 8.171 | Trillion Btu |
| 01 January, 2016 | 212.128 | -3.356 | Trillion Btu |
| 01 February, 2016 | 199.811 | -12.317 | Trillion Btu |
| 01 March, 2016 | 209.618 | + 9.807 | Trillion Btu |
| 01 April, 2016 | 196.409 | -13.209 | Trillion Btu |
| 01 May, 2016 | 206.979 | + 10.57 | Trillion Btu |
| 01 June, 2016 | 205.276 | -1.703 | Trillion Btu |
| 01 July, 2016 | 211.42 | + 6.144 | Trillion Btu |
| 01 August, 2016 | 212.508 | + 1.088 | Trillion Btu |
| 01 September, 2016 | 199.777 | -12.731 | Trillion Btu |
| 01 October, 2016 | 206.662 | + 6.885 | Trillion Btu |
| 01 November, 2016 | 208.036 | + 1.374 | Trillion Btu |
| 01 December, 2016 | 234.113 | + 26.077 | Trillion Btu |
| 01 January, 2017 | 213.549 | -20.564 | Trillion Btu |
| 01 February, 2017 | 193.247 | -20.302 | Trillion Btu |
| 01 March, 2017 | 211.837 | + 18.59 | Trillion Btu |
| 01 April, 2017 | 199.179 | -12.658 | Trillion Btu |
| 01 May, 2017 | 206.466 | + 7.287 | Trillion Btu |
| 01 June, 2017 | 205.395 | -1.071 | Trillion Btu |
| 01 July, 2017 | 211.153 | + 5.758 | Trillion Btu |
| 01 August, 2017 | 214.78 | + 3.627 | Trillion Btu |
| 01 September, 2017 | 198.359 | -16.421 | Trillion Btu |
| 01 October, 2017 | 208.158 | + 9.799 | Trillion Btu |
| 01 November, 2017 | 210.376 | + 2.218 | Trillion Btu |
| 01 December, 2017 | 217.101 | + 6.725 | Trillion Btu |
| 01 January, 2018 | 212.655 | -4.446 | Trillion Btu |
| 01 February, 2018 | 192.07 | -20.585 | Trillion Btu |
| 01 March, 2018 | 210.883 | + 18.813 | Trillion Btu |
| 01 April, 2018 | 199.863 | -11.02 | Trillion Btu |
| 01 May, 2018 | 209.305 | + 9.442 | Trillion Btu |
| 01 June, 2018 | 203.569 | -5.736 | Trillion Btu |
| 01 July, 2018 | 213.661 | + 10.092 | Trillion Btu |
| 01 August, 2018 | 213.899 | + 0.238 | Trillion Btu |
| 01 September, 2018 | 198.138 | -15.761 | Trillion Btu |
| 01 October, 2018 | 207.75 | + 9.612 | Trillion Btu |
| 01 November, 2018 | 204.547 | -3.203 | Trillion Btu |
| 01 December, 2018 | 214.064 | + 9.517 | Trillion Btu |
| 01 January, 2019 | 209.24 | -4.824 | Trillion Btu |
| 01 February, 2019 | 189.603 | -19.637 | Trillion Btu |
| 01 March, 2019 | 204.553 | + 14.95 | Trillion Btu |
| 01 April, 2019 | 196.68 | -7.873 | Trillion Btu |
| 01 May, 2019 | 203.642 | + 6.962 | Trillion Btu |
| 01 June, 2019 | 200.572 | -3.07 | Trillion Btu |
| 01 July, 2019 | 207.496 | + 6.924 | Trillion Btu |
| 01 August, 2019 | 206.525 | -0.971 | Trillion Btu |
| 01 September, 2019 | 192.32 | -14.205 | Trillion Btu |
| 01 October, 2019 | 201.185 | + 8.865 | Trillion Btu |
| 01 November, 2019 | 201.081 | -0.10400000000001 | Trillion Btu |
| 01 December, 2019 | 210.246 | + 9.165 | Trillion Btu |
| 01 January, 2020 | 208.558 | -1.688 | Trillion Btu |
| 01 February, 2020 | 194.794 | -13.764 | Trillion Btu |
| 01 March, 2020 | 197.437 | + 2.643 | Trillion Btu |
| 01 April, 2020 | 167.452 | -29.985 | Trillion Btu |
| 01 May, 2020 | 181.57 | + 14.118 | Trillion Btu |
| 01 June, 2020 | 181.193 | -0.37699999999998 | Trillion Btu |
| 01 July, 2020 | 192.02 | + 10.827 | Trillion Btu |
| 01 August, 2020 | 189.758 | -2.262 | Trillion Btu |
| 01 September, 2020 | 187.727 | -2.031 | Trillion Btu |
| 01 October, 2020 | 195.001 | + 7.274 | Trillion Btu |
| 01 November, 2020 | 197.609 | + 2.608 | Trillion Btu |
| 01 December, 2020 | 204.335 | + 6.726 | Trillion Btu |
| 01 January, 2021 | 198.791 | -5.544 | Trillion Btu |
| 01 February, 2021 | 170.106 | -28.685 | Trillion Btu |
| 01 March, 2021 | 195.706 | + 25.6 | Trillion Btu |
| Year | Year Open - Year Close | Year Min - Year Max | Year Average | Year Change |
|---|---|---|---|---|
| 2021 | 198.791 - 195.706 | 170.106 - 198.791 | 188.2 | -3.09 |
| 2020 | 208.558 - 204.335 | 167.452 - 208.558 | 191.45 | -4.22 |
| 2019 | 209.24 - 210.246 | 189.603 - 210.246 | 201.93 | + 1.01 |
| 2018 | 212.655 - 214.064 | 192.07 - 214.064 | 206.7 | + 1.41 |
| 2017 | 213.549 - 217.101 | 193.247 - 217.101 | 207.47 | + 3.55 |
| 2016 | 212.128 - 234.113 | 196.409 - 234.113 | 208.56 | + 21.99 |
| 2015 | 215.448 - 215.484 | 193.059 - 215.484 | 207.61 | + 0.04 |
| 2014 | 209.709 - 218.733 | 189.844 - 218.733 | 207.02 | + 9.02 |
| 2013 | 204.411 - 218.053 | 185.058 - 218.053 | 204.11 | + 13.64 |
| 2012 | 208.872 - 204.117 | 191.354 - 208.872 | 198.56 | -4.76 |
| 2011 | 209.042 - 213.257 | 186.355 - 213.257 | 200.07 | + 4.22 |
| 2010 | 194.785 - 206.987 | 179.413 - 206.987 | 195.29 | + 12.2 |
| 2009 | 158.795 - 177.768 | 148.396 - 177.768 | 164.37 | + 18.97 |
| 2008 | 186.135 - 163.614 | 163.165 - 186.135 | 169.59 | -22.52 |
| 2007 | 166.364 - 175.413 | 151.614 - 175.413 | 163.16 | + 9.05 |
| 2006 | 170.915 - 168.863 | 149.648 - 170.915 | 160.48 | -2.05 |
| 2005 | 162.518 - 160.295 | 151.019 - 162.518 | 155.9 | -2.22 |
| 2004 | 160.384 - 165.435 | 146.759 - 165.435 | 154.3 | + 5.05 |
| 2003 | 144.575 - 156.148 | 131.405 - 156.148 | 143.71 | + 11.57 |
| 2002 | 145.798 - 155.293 | 127.528 - 158.714 | 143.32 | + 9.5 |
| 2001 | 151.057 - 147.221 | 133.94 - 151.057 | 143.24 | -3.84 |
| 2000 | 135.51 - 176.435 | 135.51 - 176.435 | 160.68 | + 40.93 |
| 1999 | 185.479 - 149.846 | 130.626 - 195.246 | 161.2 | -35.63 |
| 1998 | 193.759 - 177.73 | 113.331 - 193.759 | 160.78 | -16.03 |
| 1997 | 190.431 - 165.438 | 147.525 - 209.299 | 171.44 | -24.99 |
| 1996 | 181.486 - 165.456 | 122.039 - 203.966 | 169.4 | -16.03 |
| 1995 | 151.629 - 167.971 | 126.223 - 203.418 | 166 | + 16.34 |
| 1994 | 212.491 - 162.956 | 114.515 - 212.491 | 160.62 | -49.54 |
| 1993 | 170.295 - 165.924 | 106.254 - 170.295 | 147.73 | -4.37 |
| 1992 | 173.577 - 160.274 | 94.633 - 173.577 | 144.77 | -13.3 |
| 1991 | 173.335 - 171.425 | 103.482 - 173.335 | 140.32 | -1.91 |
| 1990 | 150.299 - 158.423 | 99.489 - 158.423 | 143.09 | + 8.12 |
| 1989 | 160.986 - 169.675 | 135.241 - 169.675 | 155.92 | + 8.69 |
| 1988 | 171.487 - 170.911 | 160.151 - 171.911 | 168.48 | -0.58 |
| 1987 | 165.587 - 165.007 | 149.386 - 166.016 | 162.23 | -0.58 |
| 1986 | 165.682 - 165.1 | 149.471 - 166.112 | 162.33 | -0.58 |
| 1985 | 165.918 - 165.336 | 149.684 - 166.347 | 162.56 | -0.58 |
| 1984 | 165.52 - 164.938 | 154.566 - 165.949 | 162.6 | -0.58 |
| 1983 | 162.267 - 161.68 | 146.385 - 162.699 | 158.97 | -0.59 |
| 1982 | 143.159 - 142.576 | 129.127 - 143.589 | 140.23 | -0.58 |
| 1981 | 146.979 - 146.396 | 132.578 - 147.409 | 143.98 | -0.58 |
| 1980 | 138.549 - 137.97 | 129.336 - 138.976 | 136.07 | -0.58 |
| 1979 | 122.366 - 122.087 | 110.363 - 122.844 | 119.91 | -0.28 |
| 1978 | 121.761 - 121.426 | 109.93 - 122.177 | 119.33 | -0.33 |
| 1977 | 111.879 - 112.183 | 100.527 - 112.183 | 109.49 | + 0.3 |
| 1976 | 106.223 - 106.097 | 99.583 - 106.376 | 104.44 | -0.13 |
| 1975 | 93.407 - 92.973 | 84.327 - 93.424 | 91.3 | -0.43 |
| 1974 | 101.58 - 101.285 | 91.781 - 101.58 | 99.36 | -0.3 |
| 1973 | 102.1 - 102.032 | 92.287 - 102.172 | 99.97 | -0.07 |