|
| year | production | change |
| 1980 | 10 | NA |
| 1981 | 10 | 0.00 % |
| 1982 | 12 | 20.00 % |
| 1983 | 13 | 8.33 % |
| 1984 | 17 | 30.77 % |
| 1985 | 35 | 105.88 % |
| 1986 | 42 | 20.00 % |
| 1987 | 42 | 0.00 % |
| 1988 | 45 | 7.14 % |
| 1989 | 48 | 6.67 % |
| 1990 | 62 | 29.17 % |
| 1991 | 62 | 0.00 % |
| 1992 | 61.35 | -1.05 % |
| 1993 | 60.36 | -1.61 % |
| 1994 | 55 | -8.88 % |
| 1995 | 57.1 | 3.82 % |
| 1996 | 55 | -3.68 % |
| 1997 | 57 | 3.64 % |
| 1998 | 54.91 | -3.67 % |
| 1999 | 53 | -3.48 % |
| 2000 | 54.42 | 2.68 % |
| 2001 | 59.87 | 10.01 % |
| 2002 | 64.27 | 7.35 % |
| 2003 | 60 | -6.64 % |
| 2004 | 62 | 3.33 % |
| 2005 | 65.63 | 5.85 % |
| 2006 | 65.67 | 0.06 % |
Source: United States Energy Information Administration
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