| Year | Data | Change | Unit |
|---|---|---|---|
| 1949 | 4.495 | 0 | Million Btu per Barrel |
| 1950 | 4.47 | -0.025 | Million Btu per Barrel |
| 1951 | 4.446 | -0.024 | Million Btu per Barrel |
| 1952 | 4.41 | -0.036 | Million Btu per Barrel |
| 1953 | 4.404 | -0.0060000000000002 | Million Btu per Barrel |
| 1954 | 4.367 | -0.037 | Million Btu per Barrel |
| 1955 | 4.346 | -0.021 | Million Btu per Barrel |
| 1956 | 4.319 | -0.027 | Million Btu per Barrel |
| 1957 | 4.318 | -0.0010000000000003 | Million Btu per Barrel |
| 1958 | 4.328 | + 0.010000000000001 | Million Btu per Barrel |
| 1959 | 4.27 | -0.058000000000001 | Million Btu per Barrel |
| 1960 | 4.253 | -0.016999999999999 | Million Btu per Barrel |
| 1961 | 4.232 | -0.021 | Million Btu per Barrel |
| 1962 | 4.214 | -0.018 | Million Btu per Barrel |
| 1963 | 4.208 | -0.0060000000000002 | Million Btu per Barrel |
| 1964 | 4.207 | -0.0010000000000003 | Million Btu per Barrel |
| 1965 | 4.197 | -0.0099999999999998 | Million Btu per Barrel |
| 1966 | 4.206 | + 0.0090000000000003 | Million Btu per Barrel |
| 1967 | 4.176 | -0.03 | Million Btu per Barrel |
| 1968 | 4.16 | -0.016 | Million Btu per Barrel |
| 1969 | 4.112 | -0.048 | Million Btu per Barrel |
| 1970 | 4.09 | -0.022 | Million Btu per Barrel |
| 1971 | 4.067 | -0.023 | Million Btu per Barrel |
| 1972 | 4.017 | -0.05 | Million Btu per Barrel |
| 1973 | 3.995 | -0.022 | Million Btu per Barrel |
| 1974 | 3.952 | -0.043 | Million Btu per Barrel |
| 1975 | 3.923 | -0.029 | Million Btu per Barrel |
| 1976 | 3.897 | -0.026 | Million Btu per Barrel |
| 1977 | 3.871 | -0.026 | Million Btu per Barrel |
| 1978 | 3.849 | -0.022 | Million Btu per Barrel |
| 1979 | 3.862 | + 0.013 | Million Btu per Barrel |
| 1980 | 3.864 | + 0.0019999999999998 | Million Btu per Barrel |
| 1981 | 3.86 | -0.004 | Million Btu per Barrel |
| 1982 | 3.798 | -0.062 | Million Btu per Barrel |
| 1983 | 3.755 | -0.043 | Million Btu per Barrel |
| 1984 | 3.745 | -0.0099999999999998 | Million Btu per Barrel |
| 1985 | 3.752 | + 0.0069999999999997 | Million Btu per Barrel |
| 1986 | 3.733 | -0.019 | Million Btu per Barrel |
| 1987 | 3.742 | + 0.0089999999999999 | Million Btu per Barrel |
| 1988 | 3.751 | + 0.0089999999999999 | Million Btu per Barrel |
| 1989 | 3.764 | + 0.013 | Million Btu per Barrel |
| 1990 | 3.758 | -0.0059999999999998 | Million Btu per Barrel |
| 1991 | 3.74 | -0.018 | Million Btu per Barrel |
| 1992 | 3.739 | -0.0010000000000003 | Million Btu per Barrel |
| 1993 | 3.735 | -0.004 | Million Btu per Barrel |
| 1994 | 3.728 | -0.0069999999999997 | Million Btu per Barrel |
| 1995 | 3.728 | 0 | Million Btu per Barrel |
| 1996 | 3.703 | -0.025 | Million Btu per Barrel |
| 1997 | 3.686 | -0.017 | Million Btu per Barrel |
| 1998 | 3.694 | + 0.008 | Million Btu per Barrel |
| 1999 | 3.663 | -0.031 | Million Btu per Barrel |
| 2000 | 3.648 | -0.015 | Million Btu per Barrel |
| 2001 | 3.652 | + 0.004 | Million Btu per Barrel |
| 2002 | 3.646 | -0.0060000000000002 | Million Btu per Barrel |
| 2003 | 3.659 | + 0.013 | Million Btu per Barrel |
| 2004 | 3.636 | -0.023 | Million Btu per Barrel |
| 2005 | 3.638 | + 0.0019999999999998 | Million Btu per Barrel |
| 2006 | 3.622 | -0.016 | Million Btu per Barrel |
| 2007 | 3.609 | -0.013 | Million Btu per Barrel |
| 2008 | 3.614 | + 0.0049999999999999 | Million Btu per Barrel |
| 2009 | 3.598 | -0.016 | Million Btu per Barrel |
| 2010 | 3.573 | -0.025 | Million Btu per Barrel |
| 2011 | 3.573 | 0 | Million Btu per Barrel |
| 2012 | 3.588 | + 0.015 | Million Btu per Barrel |
| 2013 | 3.629 | + 0.041 | Million Btu per Barrel |
| 2014 | 3.64 | + 0.011 | Million Btu per Barrel |
| 2015 | 3.669 | + 0.029 | Million Btu per Barrel |
| 2016 | 3.632 | -0.037 | Million Btu per Barrel |
| 2017 | 3.612 | -0.02 | Million Btu per Barrel |
| 2018 | 3.591 | -0.021 | Million Btu per Barrel |
| 2019 | 3.607 | + 0.016 | Million Btu per Barrel |
| 2020 | 3.593 | -0.014 | Million Btu per Barrel |
| 2021 | 3.593 | 0 | Million Btu per Barrel |