Historical Petroleum Production (Thousand BBLS/Year)
| Year | Production |
| 2008 | 15.7 |
| 2007 | 19.2 |
| 2006 | 16.9 |
| 2005 | 26.4 |
| 2004 | 20.8 |
| 2003 | 18.5 |
| 2002 | 25.1 |
| 2001 | 11.3 |
| 2000 | 12.4 |
| 1999 | 8.5 |
| 1998 | 9.6 |
| 1997 | 10.3 |
| 1996 | 13.4 |
| 1995 | 12.7 |
| 1994 | 16.8 |
| 1993 | 12.1 |
| 1992 | 9.2 |
| 1991 | 12.2 |
| 1990 | 14.7 |
| 1989 | 21.3 |
| 1988 | 24.9 |
| 1987 | 17.1 |
| 1986 | 18.3 |
| 1985 | 26.7 |
| 1984 | 32.8 |
| 1983 | 65.4 |
| 1982 | 49.4 |
| 1981 | 13.2 |
| 1980 | 9.5 |
| 1979 | 3.7 |
| 1978 | 2.4 |
| 1977 | 1.7 |
| 1976 | 2.7 |
| 1975 | 3 |
| 1974 | 2.8 |
| 1973 | 0 |
| 1972 | 0.1 |
| 1971 | 0.6 |
| 1970 | 0.9 |
| 1969 | 0.8 |
| 1968 | 2.6 |
| 1967 | 3.5 |
| 1966 | 1.1 |
| 1965 | 3.6 |
| 1964 | 5.8 |
| 1963 | 3.5 |
| 1962 | 2.8 |
| 1961 | 3 |
| 1960 | 2 |
| 1959 | 4 |
| 1958 | 4.5 |
| 1957 | 4.5 |
| 1956 | 4.5 |
| 1955 | 4.4 |
| 1954 | 5.9 |
| 1953 | 7.2 |
| 1952 | 9.4 |
| 1951 | 10.9 |