| Year | Data | Change | Unit |
|---|---|---|---|
| 1949 | 5.692 | 0 | Million Btu per Barrel |
| 1950 | 5.766 | + 0.074 | Million Btu per Barrel |
| 1951 | 5.762 | -0.0040000000000004 | Million Btu per Barrel |
| 1952 | 5.774 | + 0.012 | Million Btu per Barrel |
| 1953 | 5.742 | -0.032 | Million Btu per Barrel |
| 1954 | 5.745 | + 0.0030000000000001 | Million Btu per Barrel |
| 1955 | 5.768 | + 0.023 | Million Btu per Barrel |
| 1956 | 5.754 | -0.014 | Million Btu per Barrel |
| 1957 | 5.78 | + 0.026000000000001 | Million Btu per Barrel |
| 1958 | 5.779 | -0.0010000000000003 | Million Btu per Barrel |
| 1959 | 5.829 | + 0.05 | Million Btu per Barrel |
| 1960 | 5.834 | + 0.0049999999999999 | Million Btu per Barrel |
| 1961 | 5.832 | -0.0019999999999998 | Million Btu per Barrel |
| 1962 | 5.841 | + 0.0090000000000003 | Million Btu per Barrel |
| 1963 | 5.84 | -0.0010000000000003 | Million Btu per Barrel |
| 1964 | 5.844 | + 0.0040000000000004 | Million Btu per Barrel |
| 1965 | 5.743 | -0.101 | Million Btu per Barrel |
| 1966 | 5.729 | -0.014 | Million Btu per Barrel |
| 1967 | 5.777 | + 0.048 | Million Btu per Barrel |
| 1968 | 5.763 | -0.014 | Million Btu per Barrel |
| 1969 | 5.714 | -0.048999999999999 | Million Btu per Barrel |
| 1970 | 5.81 | + 0.095999999999999 | Million Btu per Barrel |
| 1971 | 5.775 | -0.034999999999999 | Million Btu per Barrel |
| 1972 | 5.741 | -0.034000000000001 | Million Btu per Barrel |
| 1973 | 5.752 | + 0.011 | Million Btu per Barrel |
| 1974 | 5.774 | + 0.022 | Million Btu per Barrel |
| 1975 | 5.748 | -0.026 | Million Btu per Barrel |
| 1976 | 5.745 | -0.0030000000000001 | Million Btu per Barrel |
| 1977 | 5.797 | + 0.052 | Million Btu per Barrel |
| 1978 | 5.808 | + 0.011 | Million Btu per Barrel |
| 1979 | 5.832 | + 0.024 | Million Btu per Barrel |
| 1980 | 5.82 | -0.012 | Million Btu per Barrel |
| 1981 | 5.821 | + 0.00099999999999945 | Million Btu per Barrel |
| 1982 | 5.82 | -0.00099999999999945 | Million Btu per Barrel |
| 1983 | 5.8 | -0.02 | Million Btu per Barrel |
| 1984 | 5.85 | + 0.05 | Million Btu per Barrel |
| 1985 | 5.814 | -0.036 | Million Btu per Barrel |
| 1986 | 5.832 | + 0.018 | Million Btu per Barrel |
| 1987 | 5.858 | + 0.026 | Million Btu per Barrel |
| 1988 | 5.84 | -0.018 | Million Btu per Barrel |
| 1989 | 5.857 | + 0.017 | Million Btu per Barrel |
| 1990 | 5.833 | -0.024 | Million Btu per Barrel |
| 1991 | 5.823 | -0.0099999999999998 | Million Btu per Barrel |
| 1992 | 5.777 | -0.046 | Million Btu per Barrel |
| 1993 | 5.693 | -0.084000000000001 | Million Btu per Barrel |
| 1994 | 5.704 | + 0.011 | Million Btu per Barrel |
| 1995 | 5.703 | -0.00099999999999945 | Million Btu per Barrel |
| 1996 | 5.678 | -0.025 | Million Btu per Barrel |
| 1997 | 5.678 | 0 | Million Btu per Barrel |
| 1998 | 5.539 | -0.139 | Million Btu per Barrel |
| 1999 | 5.564 | + 0.025 | Million Btu per Barrel |
| 2000 | 5.542 | -0.022 | Million Btu per Barrel |
| 2001 | 5.641 | + 0.099 | Million Btu per Barrel |
| 2002 | 5.519 | -0.122 | Million Btu per Barrel |
| 2003 | 5.63 | + 0.111 | Million Btu per Barrel |
| 2004 | 5.539 | -0.091 | Million Btu per Barrel |
| 2005 | 5.513 | -0.026 | Million Btu per Barrel |
| 2006 | 5.423 | -0.09 | Million Btu per Barrel |
| 2007 | 5.471 | + 0.048 | Million Btu per Barrel |
| 2008 | 5.591 | + 0.12 | Million Btu per Barrel |
| 2009 | 5.677 | + 0.085999999999999 | Million Btu per Barrel |
| 2010 | 5.604 | -0.073 | Million Btu per Barrel |
| 2011 | 5.53 | -0.074 | Million Btu per Barrel |
| 2012 | 5.526 | -0.0040000000000004 | Million Btu per Barrel |
| 2013 | 5.482 | -0.044 | Million Btu per Barrel |
| 2014 | 5.406 | -0.076000000000001 | Million Btu per Barrel |
| 2015 | 5.319 | -0.087 | Million Btu per Barrel |
| 2016 | 5.245 | -0.074 | Million Btu per Barrel |
| 2017 | 5.258 | + 0.013 | Million Btu per Barrel |
| 2018 | 5.259 | + 0.0010000000000003 | Million Btu per Barrel |
| 2019 | 5.263 | + 0.0039999999999996 | Million Btu per Barrel |
| 2020 | 5.216 | -0.047 | Million Btu per Barrel |
| 2021 | 5.216 | 0 | Million Btu per Barrel |