|
| year | production | change |
| 1980 | 7 | NA |
| 1981 | 10 | 42.86 % |
| 1982 | 15 | 50.00 % |
| 1983 | 15 | 0.00 % |
| 1984 | 17 | 13.33 % |
| 1985 | 19 | 11.76 % |
| 1986 | 29 | 52.63 % |
| 1987 | 28 | -3.45 % |
| 1988 | 33 | 17.86 % |
| 1989 | 38 | 15.15 % |
| 1990 | 40 | 5.26 % |
| 1991 | 41 | 2.50 % |
| 1992 | 38.19 | -6.85 % |
| 1993 | 40.99 | 7.33 % |
| 1994 | 39.5 | -3.64 % |
| 1995 | 31.93 | -19.16 % |
| 1996 | 36.52 | 14.38 % |
| 1997 | 57.6 | 57.72 % |
| 1998 | 46.92 | -18.54 % |
| 1999 | 42 | -10.49 % |
| 2000 | 36 | -14.29 % |
| 2001 | 33.16 | -7.89 % |
| 2002 | 30.39 | -8.35 % |
| 2003 | 23.99 | -21.06 % |
| 2004 | 19.52 | -18.63 % |
| 2005 | 18.98 | -2.77 % |
| 2006 | 17.08 | -10.01 % |
Source: United States Energy Information Administration
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