|
| year | production | change |
| 1980 | 2514 | NA |
| 1981 | 1000 | -60.22 % |
| 1982 | 1012 | 1.20 % |
| 1983 | 1005 | -0.69 % |
| 1984 | 1209 | 20.30 % |
| 1985 | 1433 | 18.53 % |
| 1986 | 1690 | 17.93 % |
| 1987 | 2079 | 23.02 % |
| 1988 | 2685 | 29.15 % |
| 1989 | 2897 | 7.90 % |
| 1990 | 2040 | -29.58 % |
| 1991 | 305 | -85.05 % |
| 1992 | 425 | 39.34 % |
| 1993 | 511.7 | 20.40 % |
| 1994 | 552.53 | 7.98 % |
| 1995 | 560 | 1.35 % |
| 1996 | 578.8 | 3.36 % |
| 1997 | 1155 | 99.55 % |
| 1998 | 2150.04 | 86.15 % |
| 1999 | 2507.88 | 16.64 % |
| 2000 | 2570.68 | 2.50 % |
| 2001 | 2390 | -7.03 % |
| 2002 | 2023 | -15.36 % |
| 2003 | 1308.25 | -35.33 % |
| 2004 | 2011.47 | 53.75 % |
| 2005 | 1877.66 | -6.65 % |
| 2006 | 1995.6 | 6.28 % |
Source: United States Energy Information Administration
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