|
| year | production | change |
| 1980 | 26 | NA |
| 1981 | 34 | 30.77 % |
| 1982 | 34 | 0.00 % |
| 1983 | 35 | 2.94 % |
| 1984 | 35 | 0.00 % |
| 1985 | 50 | 42.86 % |
| 1986 | 60 | 20.00 % |
| 1987 | 65 | 8.33 % |
| 1988 | 67 | 3.08 % |
| 1989 | 65 | -2.99 % |
| 1990 | 61 | -6.15 % |
| 1991 | 58.67 | -3.82 % |
| 1992 | 57.68 | -1.69 % |
| 1993 | 55.32 | -4.09 % |
| 1994 | 56.15 | 1.50 % |
| 1995 | 50 | -10.95 % |
| 1996 | 43.16 | -13.68 % |
| 1997 | 35.67 | -17.35 % |
| 1998 | 34.49 | -3.31 % |
| 1999 | 30.49 | -11.60 % |
| 2000 | 29 | -4.89 % |
| 2001 | 27.92 | -3.72 % |
| 2002 | 26.92 | -3.58 % |
| 2003 | 24.08 | -10.55 % |
| 2004 | 23.33 | -3.11 % |
| 2005 | 21.34 | -8.53 % |
| 2006 | 21.5 | 0.75 % |
Source: United States Energy Information Administration
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