1949 | 24.916 | 0 | Million Btu per Short Ton |
1950 | 25.09 | + 0.174 | Million Btu per Short Ton |
1951 | 25.019 | -0.071000000000002 | Million Btu per Short Ton |
1952 | 25.096 | + 0.077000000000002 | Million Btu per Short Ton |
1953 | 25.147 | + 0.050999999999998 | Million Btu per Short Ton |
1954 | 25.054 | -0.093 | Million Btu per Short Ton |
1955 | 25.201 | + 0.147 | Million Btu per Short Ton |
1956 | 25.117 | -0.084 | Million Btu per Short Ton |
1957 | 25.213 | + 0.096 | Million Btu per Short Ton |
1958 | 24.983 | -0.23 | Million Btu per Short Ton |
1959 | 24.91 | -0.073 | Million Btu per Short Ton |
1960 | 24.906 | -0.0040000000000013 | Million Btu per Short Ton |
1961 | 24.849 | -0.056999999999999 | Million Btu per Short Ton |
1962 | 24.828 | -0.021000000000001 | Million Btu per Short Ton |
1963 | 24.831 | + 0.0030000000000001 | Million Btu per Short Ton |
1964 | 24.84 | + 0.0090000000000003 | Million Btu per Short Ton |
1965 | 24.775 | -0.065000000000001 | Million Btu per Short Ton |
1966 | 24.629 | -0.146 | Million Btu per Short Ton |
1967 | 24.475 | -0.154 | Million Btu per Short Ton |
1968 | 24.445 | -0.030000000000001 | Million Btu per Short Ton |
1969 | 24.28 | -0.165 | Million Btu per Short Ton |
1970 | 23.842 | -0.438 | Million Btu per Short Ton |
1971 | 23.507 | -0.335 | Million Btu per Short Ton |
1972 | 23.389 | -0.118 | Million Btu per Short Ton |
1973 | 23.376 | -0.012999999999998 | Million Btu per Short Ton |
1974 | 23.072 | -0.304 | Million Btu per Short Ton |
1975 | 22.897 | -0.175 | Million Btu per Short Ton |
1976 | 22.855 | -0.041999999999998 | Million Btu per Short Ton |
1977 | 22.597 | -0.258 | Million Btu per Short Ton |
1978 | 22.248 | -0.349 | Million Btu per Short Ton |
1979 | 22.454 | + 0.206 | Million Btu per Short Ton |
1980 | 22.415 | -0.039000000000001 | Million Btu per Short Ton |
1981 | 22.308 | -0.107 | Million Btu per Short Ton |
1982 | 22.239 | -0.068999999999999 | Million Btu per Short Ton |
1983 | 22.052 | -0.187 | Million Btu per Short Ton |
1984 | 22.01 | -0.041999999999998 | Million Btu per Short Ton |
1985 | 21.87 | -0.14 | Million Btu per Short Ton |
1986 | 21.913 | + 0.042999999999999 | Million Btu per Short Ton |
1987 | 21.922 | + 0.0090000000000003 | Million Btu per Short Ton |
1988 | 21.823 | -0.099 | Million Btu per Short Ton |
1989 | 21.765 | -0.058 | Million Btu per Short Ton |
1990 | 21.822 | + 0.056999999999999 | Million Btu per Short Ton |
1991 | 21.681 | -0.141 | Million Btu per Short Ton |
1992 | 21.682 | + 0.00099999999999767 | Million Btu per Short Ton |
1993 | 21.418 | -0.264 | Million Btu per Short Ton |
1994 | 21.394 | -0.024000000000001 | Million Btu per Short Ton |
1995 | 21.326 | -0.067999999999998 | Million Btu per Short Ton |
1996 | 21.322 | -0.0040000000000013 | Million Btu per Short Ton |
1997 | 21.296 | -0.026 | Million Btu per Short Ton |
1998 | 21.418 | + 0.122 | Million Btu per Short Ton |
1999 | 21.07 | -0.348 | Million Btu per Short Ton |
2000 | 21.072 | + 0.0019999999999989 | Million Btu per Short Ton |
2001 | 20.772 | -0.3 | Million Btu per Short Ton |
2002 | 20.673 | -0.099 | Million Btu per Short Ton |
2003 | 20.499 | -0.174 | Million Btu per Short Ton |
2004 | 20.424 | -0.074999999999999 | Million Btu per Short Ton |
2005 | 20.348 | -0.076000000000001 | Million Btu per Short Ton |
2006 | 20.31 | -0.038 | Million Btu per Short Ton |
2007 | 20.34 | + 0.030000000000001 | Million Btu per Short Ton |
2008 | 20.208 | -0.132 | Million Btu per Short Ton |
2009 | 19.963 | -0.245 | Million Btu per Short Ton |
2010 | 20.173 | + 0.21 | Million Btu per Short Ton |
2011 | 20.142 | -0.030999999999999 | Million Btu per Short Ton |
2012 | 20.215 | + 0.073 | Million Btu per Short Ton |
2013 | 20.182 | -0.033000000000001 | Million Btu per Short Ton |
2014 | 20.146 | -0.035999999999998 | Million Btu per Short Ton |
2015 | 19.88 | -0.266 | Million Btu per Short Ton |
2016 | 19.977 | + 0.097000000000001 | Million Btu per Short Ton |
2017 | 20.025 | + 0.047999999999998 | Million Btu per Short Ton |
2018 | 20.16 | + 0.135 | Million Btu per Short Ton |
2019 | 20.053 | -0.107 | Million Btu per Short Ton |
2020 | 19.858 | -0.195 | Million Btu per Short Ton |
2021 | 19.858 | 0 | Million Btu per Short Ton |