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Loading...
| year | production | consumption |
| 1980 | 65.00 | 5.00 |
| 1981 | 83.00 | 6.00 |
| 1982 | 89.00 | 5.00 |
| 1983 | 87.00 | 4.00 |
| 1984 | 121.00 | 4.00 |
| 1985 | 120.00 | 5.70 |
| 1986 | 119.00 | 5.80 |
| 1987 | 123.00 | 6.50 |
| 1988 | 144.00 | 5.80 |
| 1989 | 164.00 | 6.50 |
| 1990 | 165.00 | 7.10 |
| 1991 | 156.00 | 6.20 |
| 1992 | 174.00 | 5.80 |
| 1993 | 181.00 | 5.40 |
| 1994 | 180.00 | 5.30 |
| 1995 | 188.00 | 5.20 |
| 1996 | 201.00 | 5.00 |
| 1997 | 253.00 | 5.00 |
| 1998 | 265.00 | 5.10 |
| 1999 | 270.00 | 4.20 |
| 2000 | 280.00 | 4.40 |
| 2001 | 255.00 | 5.60 |
| 2002 | 249.00 | 4.80 |
| 2003 | 247.00 | 6.00 |
| 2004 | 235.00 | 6.70 |
| 2005 | 229.00 | 7.60 |
| 2006 | 242.00 | 8.20 |
| 2007 | 207.00 | 9.10 |
| 2008 | 233.00 | 10.00 |
| 2009 | 268.00 | 12.00 |
| 2010 | 305.00 | 17.00 |
| 2011 | 290.00 | 14.00 |
| 2012 | 280.00 | 15.00 |
| 2013 | 265.00 | 15.00 |
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