|
| year | production | change |
| 1980 | 5 | NA |
| 1981 | 3 | -40.00 % |
| 1982 | 3 | 0.00 % |
| 1983 | 3 | 0.00 % |
| 1984 | 3 | 0.00 % |
| 1985 | 2 | -33.33 % |
| 1986 | 2 | 0.00 % |
| 1987 | 3 | 50.00 % |
| 1988 | 2 | -33.33 % |
| 1989 | 2 | 0.00 % |
| 1990 | 3 | 50.00 % |
| 1991 | 2.25 | -25.00 % |
| 1992 | 2 | -11.11 % |
| 1993 | 1.13 | -43.50 % |
| 1994 | 1.3 | 15.04 % |
| 1995 | 1.22 | -6.15 % |
| 1996 | 1.22 | 0.00 % |
| 1997 | 1 | -18.03 % |
| 1998 | 0.93 | -7.00 % |
| 1999 | 0.8 | -13.98 % |
| 2000 | 0.74 | -7.50 % |
| 2001 | 0.8 | 8.11 % |
| 2002 | 0.88 | 10.00 % |
| 2003 | 0.92 | 4.55 % |
| 2004 | 0.8 | -13.04 % |
| 2005 | 0.8 | 0.00 % |
| 2006 | 0.8 | 0.00 % |
Source: United States Energy Information Administration
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