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Loading...
| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .00 | .00 |
| 1982 | .07 | .07 |
| 1983 | .20 | .20 |
| 1984 | .21 | .21 |
| 1985 | .38 | .38 |
| 1986 | .57 | .57 |
| 1987 | .71 | .71 |
| 1988 | .96 | .96 |
| 1989 | .96 | .96 |
| 1990 | 1.07 | 1.07 |
| 1991 | 1.00 | 1.00 |
| 1992 | 1.03 | 1.03 |
| 1993 | 1.04 | 1.04 |
| 1994 | 1.52 | 1.52 |
| 1995 | 2.10 | 2.10 |
| 1996 | 2.22 | 2.22 |
| 1997 | 2.63 | 2.63 |
| 1998 | 3.65 | 3.65 |
| 1999 | 3.70 | 3.70 |
| 2000 | 4.63 | 4.63 |
| 2001 | 5.73 | 5.73 |
| 2002 | 5.93 | 5.93 |
| 2003 | 6.00 | 6.00 |
| 2004 | 6.32 | 6.32 |
| 2005 | 6.27 | 6.27 |
| 2006 | 6.33 | 6.33 |
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