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Loading...
| year | production | consumption |
| 1980 | 58.00 | 16.00 |
| 1981 | 87.00 | 16.00 |
| 1982 | 109.00 | 19.00 |
| 1983 | 114.00 | 19.00 |
| 1984 | 135.00 | 19.00 |
| 1985 | 185.00 | 20.00 |
| 1986 | 177.00 | 22.00 |
| 1987 | 174.00 | 21.00 |
| 1988 | 163.00 | 20.00 |
| 1989 | 170.00 | 24.00 |
| 1990 | 161.00 | 24.00 |
| 1991 | 153.00 | 25.00 |
| 1992 | 140.00 | 25.00 |
| 1993 | 127.00 | 21.00 |
| 1994 | 108.00 | 23.00 |
| 1995 | 111.00 | 23.00 |
| 1996 | 108.00 | 23.00 |
| 1997 | 124.00 | 24.00 |
| 1998 | 121.00 | 23.00 |
| 1999 | 100.00 | 22.00 |
| 2000 | 85.00 | 23.00 |
| 2001 | 77.00 | 23.00 |
| 2002 | 70.00 | 22.00 |
| 2003 | 67.00 | 23.00 |
| 2004 | 66.00 | 24.00 |
| 2005 | 82.00 | 24.00 |
| 2006 | 86.00 | 26.00 |
| 2007 | 83.00 | 29.00 |
| 2008 | 81.00 | 31.00 |
| 2009 | 77.00 | 33.00 |
| 2010 | 65.00 | 36.00 |
| 2011 | 62.00 | 37.00 |
| 2012 | 63.00 | 39.00 |
| 2013 | 63.00 | 38.00 |
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