|
| year | production | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 1.08 | NA |
| 1993 | 0.57 | -47.22 % |
| 1994 | 0.4 | -29.82 % |
| 1995 | 0.5 | 25.00 % |
| 1996 | 0.42 | -16.00 % |
| 1997 | 0.52 | 23.81 % |
| 1998 | 0.4 | -23.08 % |
| 1999 | 0.4 | 0.00 % |
| 2000 | 0.36 | -10.00 % |
| 2001 | 0.33 | -8.33 % |
| 2002 | 0.31 | -6.06 % |
| 2003 | 0.35 | 12.90 % |
| 2004 | 0.25 | -28.57 % |
| 2005 | 0.28 | 12.00 % |
| 2006 | 0.3 | 7.14 % |
Source: United States Energy Information Administration
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