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Loading...
| year | production | consumption |
| 1980 | .00 | 45.00 |
| 1981 | .00 | 42.00 |
| 1982 | .00 | 41.00 |
| 1983 | .00 | 43.00 |
| 1984 | .00 | 41.00 |
| 1985 | .00 | 48.00 |
| 1986 | .00 | 46.00 |
| 1987 | .00 | 48.00 |
| 1988 | .00 | 43.00 |
| 1989 | .00 | 35.00 |
| 1990 | .00 | 33.00 |
| 1991 | .00 | 53.00 |
| 1992 | .00 | 55.00 |
| 1993 | .00 | 67.00 |
| 1994 | .00 | 76.00 |
| 1995 | .00 | 82.00 |
| 1996 | .00 | 85.00 |
| 1997 | .00 | 97.00 |
| 1998 | .00 | 100.00 |
| 1999 | .00 | 104.00 |
| 2000 | .00 | 106.00 |
| 2001 | .00 | 101.00 |
| 2002 | .00 | 102.00 |
| 2003 | .00 | 104.00 |
| 2004 | .00 | 102.00 |
| 2005 | .00 | 97.00 |
| 2006 | .00 | 87.00 |
| 2007 | .00 | 79.00 |
| 2008 | .00 | 103.00 |
| 2009 | .00 | 129.00 |
| 2010 | .00 | 120.00 |
| 2011 | .00 | 124.00 |
| 2012 | .00 | 127.00 |
| 2013 | .00 | 125.00 |
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