|
| year | production | change |
| 1980 | 27 | NA |
| 1981 | 22 | -18.52 % |
| 1982 | 24 | 9.09 % |
| 1983 | 22 | -8.33 % |
| 1984 | 21 | -4.55 % |
| 1985 | 20 | -4.76 % |
| 1986 | 18 | -10.00 % |
| 1987 | 19 | 5.56 % |
| 1988 | 19 | 0.00 % |
| 1989 | 20 | 5.26 % |
| 1990 | 20.92 | 4.60 % |
| 1991 | 21 | 0.38 % |
| 1992 | 21.27 | 1.29 % |
| 1993 | 22.24 | 4.56 % |
| 1994 | 22.6 | 1.62 % |
| 1995 | 28 | 23.89 % |
| 1996 | 30.14 | 7.64 % |
| 1997 | 29.2 | -3.12 % |
| 1998 | 34.6 | 18.49 % |
| 1999 | 32.4 | -6.36 % |
| 2000 | 29.92 | -7.65 % |
| 2001 | 34.34 | 14.77 % |
| 2002 | 32.16 | -6.35 % |
| 2003 | 29.33 | -8.80 % |
| 2004 | 47.64 | 62.43 % |
| 2005 | 50.73 | 6.49 % |
| 2006 | 48.9 | -3.61 % |
Source: United States Energy Information Administration
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