| Year | Data | Change | Unit |
|---|---|---|---|
| 1949 | 5.933 | 0 | Million Btu per Barrel |
| 1950 | 5.927 | -0.0060000000000002 | Million Btu per Barrel |
| 1951 | 5.897 | -0.029999999999999 | Million Btu per Barrel |
| 1952 | 5.89 | -0.0070000000000006 | Million Btu per Barrel |
| 1953 | 5.878 | -0.012 | Million Btu per Barrel |
| 1954 | 5.865 | -0.013 | Million Btu per Barrel |
| 1955 | 5.847 | -0.018 | Million Btu per Barrel |
| 1956 | 5.833 | -0.014 | Million Btu per Barrel |
| 1957 | 5.818 | -0.015000000000001 | Million Btu per Barrel |
| 1958 | 5.808 | -0.0099999999999998 | Million Btu per Barrel |
| 1959 | 5.784 | -0.024 | Million Btu per Barrel |
| 1960 | 5.772 | -0.012 | Million Btu per Barrel |
| 1961 | 5.768 | -0.0040000000000004 | Million Btu per Barrel |
| 1962 | 5.754 | -0.014 | Million Btu per Barrel |
| 1963 | 5.728 | -0.026 | Million Btu per Barrel |
| 1964 | 5.697 | -0.031 | Million Btu per Barrel |
| 1965 | 5.695 | -0.0019999999999998 | Million Btu per Barrel |
| 1966 | 5.69 | -0.0049999999999999 | Million Btu per Barrel |
| 1967 | 5.675 | -0.015000000000001 | Million Btu per Barrel |
| 1968 | 5.634 | -0.040999999999999 | Million Btu per Barrel |
| 1969 | 5.584 | -0.050000000000001 | Million Btu per Barrel |
| 1970 | 5.579 | -0.0049999999999999 | Million Btu per Barrel |
| 1971 | 5.572 | -0.0069999999999997 | Million Btu per Barrel |
| 1972 | 5.534 | -0.038 | Million Btu per Barrel |
| 1973 | 5.537 | + 0.0030000000000001 | Million Btu per Barrel |
| 1974 | 5.504 | -0.033 | Million Btu per Barrel |
| 1975 | 5.49 | -0.013999999999999 | Million Btu per Barrel |
| 1976 | 5.501 | + 0.011 | Million Btu per Barrel |
| 1977 | 5.515 | + 0.013999999999999 | Million Btu per Barrel |
| 1978 | 5.511 | -0.0039999999999996 | Million Btu per Barrel |
| 1979 | 5.384 | -0.127 | Million Btu per Barrel |
| 1980 | 5.34 | -0.044 | Million Btu per Barrel |
| 1981 | 5.268 | -0.072 | Million Btu per Barrel |
| 1982 | 5.211 | -0.056999999999999 | Million Btu per Barrel |
| 1983 | 5.214 | + 0.0030000000000001 | Million Btu per Barrel |
| 1984 | 5.167 | -0.047000000000001 | Million Btu per Barrel |
| 1985 | 5.159 | -0.008 | Million Btu per Barrel |
| 1986 | 5.237 | + 0.078 | Million Btu per Barrel |
| 1987 | 5.203 | -0.034 | Million Btu per Barrel |
| 1988 | 5.196 | -0.0070000000000006 | Million Btu per Barrel |
| 1989 | 5.19 | -0.0059999999999993 | Million Btu per Barrel |
| 1990 | 5.219 | + 0.029 | Million Btu per Barrel |
| 1991 | 5.13 | -0.089 | Million Btu per Barrel |
| 1992 | 5.133 | + 0.0030000000000001 | Million Btu per Barrel |
| 1993 | 5.14 | + 0.0069999999999997 | Million Btu per Barrel |
| 1994 | 5.115 | -0.024999999999999 | Million Btu per Barrel |
| 1995 | 5.084 | -0.031000000000001 | Million Btu per Barrel |
| 1996 | 5.076 | -0.008 | Million Btu per Barrel |
| 1997 | 5.083 | + 0.0070000000000006 | Million Btu per Barrel |
| 1998 | 5.101 | + 0.018 | Million Btu per Barrel |
| 1999 | 5.052 | -0.049 | Million Btu per Barrel |
| 2000 | 5.015 | -0.037 | Million Btu per Barrel |
| 2001 | 5.104 | + 0.089 | Million Btu per Barrel |
| 2002 | 5.053 | -0.051 | Million Btu per Barrel |
| 2003 | 5.108 | + 0.055 | Million Btu per Barrel |
| 2004 | 5.106 | -0.0019999999999998 | Million Btu per Barrel |
| 2005 | 5.143 | + 0.037 | Million Btu per Barrel |
| 2006 | 5.12 | -0.023 | Million Btu per Barrel |
| 2007 | 5.079 | -0.041 | Million Btu per Barrel |
| 2008 | 5.103 | + 0.024 | Million Btu per Barrel |
| 2009 | 4.959 | -0.144 | Million Btu per Barrel |
| 2010 | 4.921 | -0.037999999999999 | Million Btu per Barrel |
| 2011 | 4.887 | -0.034000000000001 | Million Btu per Barrel |
| 2012 | 4.844 | -0.042999999999999 | Million Btu per Barrel |
| 2013 | 4.801 | -0.043 | Million Btu per Barrel |
| 2014 | 4.804 | + 0.0030000000000001 | Million Btu per Barrel |
| 2015 | 4.767 | -0.037 | Million Btu per Barrel |
| 2016 | 4.798 | + 0.031 | Million Btu per Barrel |
| 2017 | 4.768 | -0.03 | Million Btu per Barrel |
| 2018 | 4.664 | -0.104 | Million Btu per Barrel |
| 2019 | 4.645 | -0.019 | Million Btu per Barrel |
| 2020 | 4.538 | -0.107 | Million Btu per Barrel |
| 2021 | 4.538 | 0 | Million Btu per Barrel |