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Loading...
| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .02 | .02 |
| 1984 | .04 | .04 |
| 1985 | .06 | .06 |
| 1986 | .14 | .14 |
| 1987 | .18 | .18 |
| 1988 | .30 | .30 |
| 1989 | .44 | .44 |
| 1990 | .80 | .80 |
| 1991 | 1.04 | 1.04 |
| 1992 | 1.36 | 1.36 |
| 1993 | 1.67 | 1.67 |
| 1994 | 1.85 | 1.85 |
| 1995 | 1.98 | 1.98 |
| 1996 | 2.28 | 2.28 |
| 1997 | 3.13 | 3.13 |
| 1998 | 4.08 | 4.08 |
| 1999 | 4.59 | 4.59 |
| 2000 | 5.79 | 5.79 |
| 2001 | 6.09 | 6.09 |
| 2002 | 7.01 | 7.01 |
| 2003 | 8.29 | 8.29 |
| 2004 | 9.64 | 9.64 |
| 2005 | 10.15 | 10.15 |
| 2006 | 9.53 | 9.53 |
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