| Year | Data | Change | Unit |
|---|---|---|---|
| 1949 | 5.813 | 0 | Million Btu per Barrel |
| 1950 | 5.817 | + 0.0040000000000004 | Million Btu per Barrel |
| 1951 | 5.809 | -0.008 | Million Btu per Barrel |
| 1952 | 5.802 | -0.0070000000000006 | Million Btu per Barrel |
| 1953 | 5.794 | -0.008 | Million Btu per Barrel |
| 1954 | 5.78 | -0.013999999999999 | Million Btu per Barrel |
| 1955 | 5.781 | + 0.00099999999999945 | Million Btu per Barrel |
| 1956 | 5.775 | -0.0059999999999993 | Million Btu per Barrel |
| 1957 | 5.757 | -0.018000000000001 | Million Btu per Barrel |
| 1958 | 5.745 | -0.012 | Million Btu per Barrel |
| 1959 | 5.739 | -0.0060000000000002 | Million Btu per Barrel |
| 1960 | 5.781 | + 0.042 | Million Btu per Barrel |
| 1961 | 5.779 | -0.0019999999999998 | Million Btu per Barrel |
| 1962 | 5.763 | -0.016 | Million Btu per Barrel |
| 1963 | 5.741 | -0.022 | Million Btu per Barrel |
| 1964 | 5.725 | -0.016 | Million Btu per Barrel |
| 1965 | 5.761 | + 0.036 | Million Btu per Barrel |
| 1966 | 5.766 | + 0.0049999999999999 | Million Btu per Barrel |
| 1967 | 5.761 | -0.0049999999999999 | Million Btu per Barrel |
| 1968 | 5.737 | -0.024 | Million Btu per Barrel |
| 1969 | 5.701 | -0.036 | Million Btu per Barrel |
| 1970 | 5.709 | + 0.008 | Million Btu per Barrel |
| 1971 | 5.693 | -0.016 | Million Btu per Barrel |
| 1972 | 5.67 | -0.023 | Million Btu per Barrel |
| 1973 | 5.69 | + 0.02 | Million Btu per Barrel |
| 1974 | 5.684 | -0.0060000000000002 | Million Btu per Barrel |
| 1975 | 5.649 | -0.035 | Million Btu per Barrel |
| 1976 | 5.673 | + 0.024 | Million Btu per Barrel |
| 1977 | 5.682 | + 0.0090000000000003 | Million Btu per Barrel |
| 1978 | 5.666 | -0.016 | Million Btu per Barrel |
| 1979 | 5.718 | + 0.052 | Million Btu per Barrel |
| 1980 | 5.752 | + 0.034 | Million Btu per Barrel |
| 1981 | 5.693 | -0.059 | Million Btu per Barrel |
| 1982 | 5.699 | + 0.0060000000000002 | Million Btu per Barrel |
| 1983 | 5.592 | -0.107 | Million Btu per Barrel |
| 1984 | 5.658 | + 0.066000000000001 | Million Btu per Barrel |
| 1985 | 5.598 | -0.06 | Million Btu per Barrel |
| 1986 | 5.632 | + 0.034 | Million Btu per Barrel |
| 1987 | 5.594 | -0.037999999999999 | Million Btu per Barrel |
| 1988 | 5.598 | + 0.0039999999999996 | Million Btu per Barrel |
| 1989 | 5.549 | -0.048999999999999 | Million Btu per Barrel |
| 1990 | 5.554 | + 0.0049999999999999 | Million Btu per Barrel |
| 1991 | 5.529 | -0.025 | Million Btu per Barrel |
| 1992 | 5.514 | -0.015 | Million Btu per Barrel |
| 1993 | 5.505 | -0.0090000000000003 | Million Btu per Barrel |
| 1994 | 5.513 | + 0.008 | Million Btu per Barrel |
| 1995 | 5.476 | -0.037 | Million Btu per Barrel |
| 1996 | 5.431 | -0.045 | Million Btu per Barrel |
| 1997 | 5.389 | -0.042 | Million Btu per Barrel |
| 1998 | 5.363 | -0.026 | Million Btu per Barrel |
| 1999 | 5.289 | -0.074000000000001 | Million Btu per Barrel |
| 2000 | 5.313 | + 0.024 | Million Btu per Barrel |
| 2001 | 5.323 | + 0.010000000000001 | Million Btu per Barrel |
| 2002 | 5.291 | -0.032 | Million Btu per Barrel |
| 2003 | 5.313 | + 0.021999999999999 | Million Btu per Barrel |
| 2004 | 5.324 | + 0.011 | Million Btu per Barrel |
| 2005 | 5.36 | + 0.036 | Million Btu per Barrel |
| 2006 | 5.296 | -0.064 | Million Btu per Barrel |
| 2007 | 5.27 | -0.026000000000001 | Million Btu per Barrel |
| 2008 | 5.156 | -0.114 | Million Btu per Barrel |
| 2009 | 5.217 | + 0.061 | Million Btu per Barrel |
| 2010 | 5.195 | -0.021999999999999 | Million Btu per Barrel |
| 2011 | 5.176 | -0.019 | Million Btu per Barrel |
| 2012 | 5.126 | -0.05 | Million Btu per Barrel |
| 2013 | 5.053 | -0.073 | Million Btu per Barrel |
| 2014 | 5.016 | -0.037 | Million Btu per Barrel |
| 2015 | 5.05 | + 0.034 | Million Btu per Barrel |
| 2016 | 5.022 | -0.028 | Million Btu per Barrel |
| 2017 | 5.006 | -0.016 | Million Btu per Barrel |
| 2018 | 4.971 | -0.035 | Million Btu per Barrel |
| 2019 | 4.962 | -0.0090000000000003 | Million Btu per Barrel |
| 2020 | 4.941 | -0.021 | Million Btu per Barrel |
| 2021 | 4.941 | 0 | Million Btu per Barrel |