| Year | Data | Change | Unit |
|---|---|---|---|
| 1949 | 5.642 | 0 | Million Btu per Barrel |
| 1950 | 5.642 | 0 | Million Btu per Barrel |
| 1951 | 5.626 | -0.016 | Million Btu per Barrel |
| 1952 | 5.613 | -0.013 | Million Btu per Barrel |
| 1953 | 5.599 | -0.014 | Million Btu per Barrel |
| 1954 | 5.586 | -0.013 | Million Btu per Barrel |
| 1955 | 5.581 | -0.0049999999999999 | Million Btu per Barrel |
| 1956 | 5.575 | -0.0060000000000002 | Million Btu per Barrel |
| 1957 | 5.567 | -0.008 | Million Btu per Barrel |
| 1958 | 5.556 | -0.011 | Million Btu per Barrel |
| 1959 | 5.545 | -0.011 | Million Btu per Barrel |
| 1960 | 5.542 | -0.0030000000000001 | Million Btu per Barrel |
| 1961 | 5.539 | -0.0030000000000001 | Million Btu per Barrel |
| 1962 | 5.531 | -0.008 | Million Btu per Barrel |
| 1963 | 5.52 | -0.011 | Million Btu per Barrel |
| 1964 | 5.513 | -0.0069999999999997 | Million Btu per Barrel |
| 1965 | 5.517 | + 0.0040000000000004 | Million Btu per Barrel |
| 1966 | 5.517 | 0 | Million Btu per Barrel |
| 1967 | 5.513 | -0.0040000000000004 | Million Btu per Barrel |
| 1968 | 5.501 | -0.012 | Million Btu per Barrel |
| 1969 | 5.489 | -0.012 | Million Btu per Barrel |
| 1970 | 5.499 | + 0.0099999999999998 | Million Btu per Barrel |
| 1971 | 5.5 | + 0.0010000000000003 | Million Btu per Barrel |
| 1972 | 5.495 | -0.0049999999999999 | Million Btu per Barrel |
| 1973 | 5.51 | + 0.015 | Million Btu per Barrel |
| 1974 | 5.498 | -0.012 | Million Btu per Barrel |
| 1975 | 5.489 | -0.0090000000000003 | Million Btu per Barrel |
| 1976 | 5.499 | + 0.0099999999999998 | Million Btu per Barrel |
| 1977 | 5.512 | + 0.013 | Million Btu per Barrel |
| 1978 | 5.512 | 0 | Million Btu per Barrel |
| 1979 | 5.487 | -0.024999999999999 | Million Btu per Barrel |
| 1980 | 5.472 | -0.015 | Million Btu per Barrel |
| 1981 | 5.44 | -0.032 | Million Btu per Barrel |
| 1982 | 5.406 | -0.034000000000001 | Million Btu per Barrel |
| 1983 | 5.396 | -0.0099999999999998 | Million Btu per Barrel |
| 1984 | 5.385 | -0.011 | Million Btu per Barrel |
| 1985 | 5.377 | -0.008 | Million Btu per Barrel |
| 1986 | 5.41 | + 0.033 | Million Btu per Barrel |
| 1987 | 5.395 | -0.015000000000001 | Million Btu per Barrel |
| 1988 | 5.402 | + 0.0070000000000006 | Million Btu per Barrel |
| 1989 | 5.403 | + 0.00099999999999945 | Million Btu per Barrel |
| 1990 | 5.403 | 0 | Million Btu per Barrel |
| 1991 | 5.375 | -0.028 | Million Btu per Barrel |
| 1992 | 5.369 | -0.0060000000000002 | Million Btu per Barrel |
| 1993 | 5.354 | -0.015 | Million Btu per Barrel |
| 1994 | 5.344 | -0.0099999999999998 | Million Btu per Barrel |
| 1995 | 5.326 | -0.018000000000001 | Million Btu per Barrel |
| 1996 | 5.323 | -0.0029999999999992 | Million Btu per Barrel |
| 1997 | 5.322 | -0.0010000000000003 | Million Btu per Barrel |
| 1998 | 5.335 | + 0.013 | Million Btu per Barrel |
| 1999 | 5.313 | -0.022 | Million Btu per Barrel |
| 2000 | 5.311 | -0.0019999999999998 | Million Btu per Barrel |
| 2001 | 5.331 | + 0.02 | Million Btu per Barrel |
| 2002 | 5.309 | -0.022 | Million Btu per Barrel |
| 2003 | 5.326 | + 0.016999999999999 | Million Btu per Barrel |
| 2004 | 5.33 | + 0.0040000000000004 | Million Btu per Barrel |
| 2005 | 5.342 | + 0.012 | Million Btu per Barrel |
| 2006 | 5.323 | -0.018999999999999 | Million Btu per Barrel |
| 2007 | 5.293 | -0.03 | Million Btu per Barrel |
| 2008 | 5.268 | -0.025 | Million Btu per Barrel |
| 2009 | 5.218 | -0.05 | Million Btu per Barrel |
| 2010 | 5.204 | -0.014 | Million Btu per Barrel |
| 2011 | 5.193 | -0.011 | Million Btu per Barrel |
| 2012 | 5.176 | -0.016999999999999 | Million Btu per Barrel |
| 2013 | 5.157 | -0.019 | Million Btu per Barrel |
| 2014 | 5.161 | + 0.0039999999999996 | Million Btu per Barrel |
| 2015 | 5.154 | -0.0069999999999997 | Million Btu per Barrel |
| 2016 | 5.161 | + 0.0069999999999997 | Million Btu per Barrel |
| 2017 | 5.153 | -0.008 | Million Btu per Barrel |
| 2018 | 5.122 | -0.031 | Million Btu per Barrel |
| 2019 | 5.111 | -0.011 | Million Btu per Barrel |
| 2020 | 5.056 | -0.055 | Million Btu per Barrel |
| 2021 | 5.056 | 0 | Million Btu per Barrel |