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Loading...
| year | production | consumption |
| 1980 | 25.96 | 25.96 |
| 1981 | 28.22 | 28.22 |
| 1982 | 38.48 | 38.48 |
| 1983 | 42.64 | 42.64 |
| 1984 | 48.08 | 48.08 |
| 1985 | 50.84 | 50.84 |
| 1986 | 56.40 | 56.40 |
| 1987 | 62.60 | 62.60 |
| 1988 | 64.98 | 64.98 |
| 1989 | 113.66 | 113.66 |
| 1990 | 121.96 | 121.96 |
| 1991 | 135.31 | 135.31 |
| 1992 | 150.05 | 150.05 |
| 1993 | 155.25 | 155.25 |
| 1994 | 163.12 | 163.12 |
| 1995 | 171.11 | 171.11 |
| 1996 | 177.68 | 177.68 |
| 1997 | 193.12 | 193.12 |
| 1998 | 206.10 | 206.10 |
| 1999 | 219.80 | 219.80 |
| 2000 | 240.89 | 240.89 |
| 2001 | 251.23 | 251.23 |
| 2002 | 282.77 | 282.77 |
| 2003 | 306.67 | 306.67 |
| 2004 | 339.33 | 339.33 |
| 2005 | 371.79 | 371.79 |
| 2006 | 414.35 | 414.35 |
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