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Loading...
| year | production | consumption |
| 1980 | 17.00 | 17.00 |
| 1981 | 8.80 | 8.80 |
| 1982 | 9.00 | 9.00 |
| 1983 | 8.80 | 8.80 |
| 1984 | 9.00 | 9.00 |
| 1985 | 5.00 | 5.00 |
| 1986 | 9.00 | 9.00 |
| 1987 | 22.00 | 22.00 |
| 1988 | 18.00 | 18.00 |
| 1989 | 35.00 | 35.00 |
| 1990 | 103.00 | 103.00 |
| 1991 | 124.00 | 124.00 |
| 1992 | 127.00 | 127.00 |
| 1993 | 131.00 | 131.00 |
| 1994 | 134.00 | 134.00 |
| 1995 | 104.00 | 104.00 |
| 1996 | 142.00 | 142.00 |
| 1997 | 161.00 | 161.00 |
| 1998 | 203.00 | 203.00 |
| 1999 | 213.00 | 213.00 |
| 2000 | 215.00 | 215.00 |
| 2001 | 197.00 | 197.00 |
| 2002 | 240.00 | 240.00 |
| 2003 | 242.00 | 242.00 |
| 2004 | 251.00 | 251.00 |
| 2005 | 215.00 | 215.00 |
| 2006 | 221.00 | 221.00 |
| 2007 | 212.00 | 212.00 |
| 2008 | 208.00 | 213.00 |
| 2009 | 230.00 | 262.00 |
| 2010 | 316.00 | 340.00 |
| 2011 | 278.00 | 287.00 |
| 2012 | 228.00 | 228.00 |
| 2013 | 187.00 | 187.00 |
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