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Loading...
| year | production | consumption |
| 1980 | .00 | 12.00 |
| 1981 | .00 | 12.00 |
| 1982 | .00 | 14.00 |
| 1983 | .00 | 14.00 |
| 1984 | .00 | 15.00 |
| 1985 | .00 | 16.00 |
| 1986 | .00 | 17.00 |
| 1987 | .00 | 17.00 |
| 1988 | .00 | 17.00 |
| 1989 | .00 | 17.00 |
| 1990 | .00 | 16.00 |
| 1991 | .00 | 15.00 |
| 1992 | .00 | 13.00 |
| 1993 | .00 | 13.00 |
| 1994 | .00 | 13.00 |
| 1995 | .00 | 11.00 |
| 1996 | .00 | 12.00 |
| 1997 | .00 | 8.00 |
| 1998 | .10 | 8.50 |
| 1999 | .20 | 8.70 |
| 2000 | .20 | 8.50 |
| 2001 | .20 | 9.90 |
| 2002 | .40 | 11.00 |
| 2003 | .50 | 10.00 |
| 2004 | .60 | 12.00 |
| 2005 | .60 | 13.00 |
| 2006 | 1.00 | 14.00 |
| 2007 | 2.30 | 15.00 |
| 2008 | 3.20 | 18.00 |
| 2009 | 5.10 | 17.00 |
| 2010 | 6.00 | 17.00 |
| 2011 | 7.00 | 22.00 |
| 2012 | 9.90 | 25.00 |
| 2013 | 14.00 | 24.00 |
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