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Loading...
| year | production | consumption |
| 1980 | .00 | .00 |
| 1981 | .00 | .00 |
| 1982 | .00 | .00 |
| 1983 | .00 | .00 |
| 1984 | 6.20 | 14.00 |
| 1985 | 6.20 | 14.00 |
| 1986 | 6.70 | 14.00 |
| 1987 | 7.40 | 15.00 |
| 1988 | 7.00 | 16.00 |
| 1989 | 8.00 | 17.00 |
| 1990 | 5.60 | 18.00 |
| 1991 | 5.00 | 19.00 |
| 1992 | 6.30 | 21.00 |
| 1993 | 6.60 | 23.00 |
| 1994 | 6.10 | 24.00 |
| 1995 | 7.60 | 26.00 |
| 1996 | 8.50 | 29.00 |
| 1997 | 9.50 | 30.00 |
| 1998 | 10.00 | 32.00 |
| 1999 | 11.00 | 33.00 |
| 2000 | 11.00 | 33.00 |
| 2001 | 12.00 | 32.00 |
| 2002 | 7.50 | 31.00 |
| 2003 | 11.00 | 32.00 |
| 2004 | 11.00 | 32.00 |
| 2005 | 11.00 | 31.00 |
| 2006 | 12.00 | 31.00 |
| 2007 | 13.00 | 41.00 |
| 2008 | 11.00 | 42.00 |
| 2009 | 11.00 | 47.00 |
| 2010 | 10.00 | 40.00 |
| 2011 | 14.00 | 41.00 |
| 2012 | 13.00 | 41.00 |
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