|
| year | production | change |
| 1980 | 33 | NA |
| 1981 | 41 | 24.24 % |
| 1982 | 43 | 4.88 % |
| 1983 | 39 | -9.30 % |
| 1984 | 38 | -2.56 % |
| 1985 | 36 | -5.26 % |
| 1986 | 31 | -13.89 % |
| 1987 | 30 | -3.23 % |
| 1988 | 24.4 | -18.67 % |
| 1989 | 22 | -9.84 % |
| 1990 | 19.61 | -10.86 % |
| 1991 | 17 | -13.31 % |
| 1992 | 15 | -11.76 % |
| 1993 | 13.96 | -6.93 % |
| 1994 | 12.41 | -11.10 % |
| 1995 | 10.58 | -14.75 % |
| 1996 | 9.18 | -13.23 % |
| 1997 | 7.35 | -19.93 % |
| 1998 | 8.08 | 9.93 % |
| 1999 | 7.7 | -4.70 % |
| 2000 | 6.76 | -12.21 % |
| 2001 | 6.64 | -1.78 % |
| 2002 | 6 | -9.64 % |
| 2003 | 6 | 0.00 % |
| 2004 | 5.59 | -6.83 % |
| 2005 | 4.42 | -20.93 % |
| 2006 | 2.99 | -32.35 % |
Source: United States Energy Information Administration
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