|
| year | production | consumption |
| 1980 | 0 | 0.4 |
| 1981 | 0 | 0.4 |
| 1982 | 0 | 0.5 |
| 1983 | 0 | 0.5 |
| 1984 | 0 | 0.5 |
| 1985 | 0 | 0.57 |
| 1986 | 0 | 0.57 |
| 1987 | 0 | 0.55 |
| 1988 | 0 | 0.55 |
| 1989 | 0 | 0.79 |
| 1990 | 0 | 0.81 |
| 1991 | 0.1 | 0.86 |
| 1992 | 1.55 | 0.81 |
| 1993 | 4.5 | 0.88 |
| 1994 | 5 | 0.88 |
| 1995 | 5 | 0.87 |
| 1996 | 17.09 | 0.89 |
| 1997 | 52.42 | 0.96 |
| 1998 | 83 | 0.96 |
| 1999 | 102 | 0.96 |
| 2000 | 167.5 | 1.53 |
| 2001 | 181.44 | 1.15 |
| 2002 | 212.56 | 1.15 |
| 2003 | 206.47 | 1.19 |
| 2004 | 365.46 | 1.03 |
| 2005 | 362.53 | 1.07 |
| 2006 | 342.87 | 1 |
Source: United States Energy Information Administration
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