| Year | Data | Change | Unit |
|---|---|---|---|
| 1949 | 5.651 | 0 | Million Btu per Barrel |
| 1950 | 5.751 | + 0.1 | Million Btu per Barrel |
| 1951 | 5.753 | + 0.0019999999999998 | Million Btu per Barrel |
| 1952 | 5.768 | + 0.015 | Million Btu per Barrel |
| 1953 | 5.732 | -0.036 | Million Btu per Barrel |
| 1954 | 5.738 | + 0.0060000000000002 | Million Btu per Barrel |
| 1955 | 5.765 | + 0.026999999999999 | Million Btu per Barrel |
| 1956 | 5.744 | -0.021 | Million Btu per Barrel |
| 1957 | 5.774 | + 0.03 | Million Btu per Barrel |
| 1958 | 5.778 | + 0.0039999999999996 | Million Btu per Barrel |
| 1959 | 5.83 | + 0.052 | Million Btu per Barrel |
| 1960 | 5.835 | + 0.0049999999999999 | Million Btu per Barrel |
| 1961 | 5.833 | -0.0019999999999998 | Million Btu per Barrel |
| 1962 | 5.842 | + 0.0089999999999995 | Million Btu per Barrel |
| 1963 | 5.841 | -0.00099999999999945 | Million Btu per Barrel |
| 1964 | 5.845 | + 0.0039999999999996 | Million Btu per Barrel |
| 1965 | 5.742 | -0.103 | Million Btu per Barrel |
| 1966 | 5.728 | -0.014 | Million Btu per Barrel |
| 1967 | 5.758 | + 0.03 | Million Btu per Barrel |
| 1968 | 5.762 | + 0.0039999999999996 | Million Btu per Barrel |
| 1969 | 5.713 | -0.048999999999999 | Million Btu per Barrel |
| 1970 | 5.811 | + 0.098 | Million Btu per Barrel |
| 1971 | 5.775 | -0.036 | Million Btu per Barrel |
| 1972 | 5.741 | -0.034000000000001 | Million Btu per Barrel |
| 1973 | 5.752 | + 0.011 | Million Btu per Barrel |
| 1974 | 5.773 | + 0.021 | Million Btu per Barrel |
| 1975 | 5.747 | -0.026 | Million Btu per Barrel |
| 1976 | 5.743 | -0.0039999999999996 | Million Btu per Barrel |
| 1977 | 5.796 | + 0.053 | Million Btu per Barrel |
| 1978 | 5.814 | + 0.018 | Million Btu per Barrel |
| 1979 | 5.864 | + 0.05 | Million Btu per Barrel |
| 1980 | 5.841 | -0.023 | Million Btu per Barrel |
| 1981 | 5.837 | -0.0040000000000004 | Million Btu per Barrel |
| 1982 | 5.829 | -0.008 | Million Btu per Barrel |
| 1983 | 5.8 | -0.029 | Million Btu per Barrel |
| 1984 | 5.867 | + 0.067 | Million Btu per Barrel |
| 1985 | 5.819 | -0.048 | Million Btu per Barrel |
| 1986 | 5.839 | + 0.02 | Million Btu per Barrel |
| 1987 | 5.86 | + 0.021 | Million Btu per Barrel |
| 1988 | 5.842 | -0.018000000000001 | Million Btu per Barrel |
| 1989 | 5.869 | + 0.027 | Million Btu per Barrel |
| 1990 | 5.838 | -0.031 | Million Btu per Barrel |
| 1991 | 5.827 | -0.011 | Million Btu per Barrel |
| 1992 | 5.774 | -0.053 | Million Btu per Barrel |
| 1993 | 5.681 | -0.093 | Million Btu per Barrel |
| 1994 | 5.693 | + 0.012 | Million Btu per Barrel |
| 1995 | 5.692 | -0.00099999999999945 | Million Btu per Barrel |
| 1996 | 5.663 | -0.029 | Million Btu per Barrel |
| 1997 | 5.663 | 0 | Million Btu per Barrel |
| 1998 | 5.505 | -0.158 | Million Btu per Barrel |
| 1999 | 5.53 | + 0.025 | Million Btu per Barrel |
| 2000 | 5.529 | -0.0010000000000003 | Million Btu per Barrel |
| 2001 | 5.637 | + 0.108 | Million Btu per Barrel |
| 2002 | 5.517 | -0.12 | Million Btu per Barrel |
| 2003 | 5.628 | + 0.111 | Million Btu per Barrel |
| 2004 | 5.532 | -0.096 | Million Btu per Barrel |
| 2005 | 5.504 | -0.028 | Million Btu per Barrel |
| 2006 | 5.415 | -0.089 | Million Btu per Barrel |
| 2007 | 5.465 | + 0.05 | Million Btu per Barrel |
| 2008 | 5.587 | + 0.122 | Million Btu per Barrel |
| 2009 | 5.674 | + 0.087000000000001 | Million Btu per Barrel |
| 2010 | 5.601 | -0.073 | Million Btu per Barrel |
| 2011 | 5.526 | -0.075 | Million Btu per Barrel |
| 2012 | 5.52 | -0.0060000000000002 | Million Btu per Barrel |
| 2013 | 5.47 | -0.05 | Million Btu per Barrel |
| 2014 | 5.369 | -0.101 | Million Btu per Barrel |
| 2015 | 5.279 | -0.09 | Million Btu per Barrel |
| 2016 | 5.184 | -0.095 | Million Btu per Barrel |
| 2017 | 5.151 | -0.033 | Million Btu per Barrel |
| 2018 | 5.088 | -0.063 | Million Btu per Barrel |
| 2019 | 5.022 | -0.066 | Million Btu per Barrel |
| 2020 | 4.922 | -0.1 | Million Btu per Barrel |
| 2021 | 4.922 | 0 | Million Btu per Barrel |