|
| year | production | consumption |
| 1980 | 0 | 1.52 |
| 1981 | 0 | 2.25 |
| 1982 | 0 | 3 |
| 1983 | 0 | 4 |
| 1984 | 0 | 6 |
| 1985 | 0 | 5.23 |
| 1986 | 0 | 6.57 |
| 1987 | 0 | 6.64 |
| 1988 | 0 | 6.59 |
| 1989 | 0 | 6.56 |
| 1990 | 0 | 6.26 |
| 1991 | 0 | 6.15 |
| 1992 | 0 | 5.97 |
| 1993 | 0 | 5.87 |
| 1994 | 0 | 4.71 |
| 1995 | 0 | 4.87 |
| 1996 | 0 | 4.85 |
| 1997 | 0 | 4.87 |
| 1998 | 0 | 4.87 |
| 1999 | 0 | 4.87 |
| 2000 | 0 | 4.58 |
| 2001 | 0 | 4.59 |
| 2002 | 0 | 4.82 |
| 2003 | 0 | 5.73 |
| 2004 | 0 | 5.68 |
| 2005 | 0 | 6.27 |
| 2006 | 0 | 6.3 |
Source: United States Energy Information Administration
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