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Loading...
| year | production | consumption |
| 1980 | .00 | 18.00 |
| 1981 | .00 | 100.00 |
| 1982 | .00 | 51.00 |
| 1983 | .00 | 35.00 |
| 1984 | .00 | 91.00 |
| 1985 | .00 | 99.00 |
| 1986 | .00 | 94.00 |
| 1987 | .00 | 101.00 |
| 1988 | .00 | 125.00 |
| 1989 | .00 | 144.00 |
| 1990 | .00 | 166.00 |
| 1991 | .00 | 166.00 |
| 1992 | .00 | 174.00 |
| 1993 | .00 | 144.00 |
| 1994 | .00 | 134.00 |
| 1995 | .00 | 172.00 |
| 1996 | .00 | 159.00 |
| 1997 | .00 | 162.00 |
| 1998 | .00 | 131.00 |
| 1999 | .00 | 128.00 |
| 2000 | .00 | 118.00 |
| 2001 | .00 | 118.00 |
| 2002 | .00 | 176.00 |
| 2003 | .00 | 165.00 |
| 2004 | .00 | 193.00 |
| 2005 | .00 | 160.00 |
| 2006 | .00 | 214.00 |
| 2007 | .00 | 196.00 |
| 2008 | .00 | 195.00 |
| 2009 | .00 | 170.00 |
| 2010 | .00 | 295.00 |
| 2011 | .00 | 422.00 |
| 2012 | .00 | 378.00 |
| 2013 | .00 | 374.00 |
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