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Loading...
| year | production | consumption |
| 1980 | .00 | 34.00 |
| 1981 | .00 | 34.00 |
| 1982 | .00 | 35.00 |
| 1983 | .00 | 36.00 |
| 1984 | .00 | 39.00 |
| 1985 | .00 | 33.00 |
| 1986 | .00 | 31.00 |
| 1987 | .00 | 36.00 |
| 1988 | .00 | 34.00 |
| 1989 | .00 | 31.00 |
| 1990 | .00 | 35.00 |
| 1991 | .00 | 34.00 |
| 1992 | .00 | 37.00 |
| 1993 | .00 | 41.00 |
| 1994 | .00 | 45.00 |
| 1995 | .00 | 48.00 |
| 1996 | .00 | 53.00 |
| 1997 | .00 | 60.00 |
| 1998 | .00 | 61.00 |
| 1999 | .00 | 66.00 |
| 2000 | .00 | 75.00 |
| 2001 | .00 | 73.00 |
| 2002 | .00 | 76.00 |
| 2003 | .00 | 78.00 |
| 2004 | .00 | 81.00 |
| 2005 | .00 | 87.00 |
| 2006 | .00 | 84.00 |
| 2007 | .00 | 88.00 |
| 2008 | .00 | 84.00 |
| 2009 | .00 | 81.00 |
| 2010 | .00 | 89.00 |
| 2011 | .00 | 100.00 |
| 2012 | .00 | 108.00 |
| 2013 | .00 | 108.00 |
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