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Loading...
| year | production | consumption |
| 1980 | 33.00 | 107.00 |
| 1981 | 41.00 | 104.00 |
| 1982 | 43.00 | 102.00 |
| 1983 | 39.00 | 96.00 |
| 1984 | 38.00 | 101.00 |
| 1985 | 36.00 | 98.00 |
| 1986 | 31.00 | 104.00 |
| 1987 | 30.00 | 108.00 |
| 1988 | 24.00 | 120.00 |
| 1989 | 22.00 | 135.00 |
| 1990 | 20.00 | 145.00 |
| 1991 | 17.00 | 153.00 |
| 1992 | 15.00 | 165.00 |
| 1993 | 14.00 | 179.00 |
| 1994 | 12.00 | 196.00 |
| 1995 | 11.00 | 212.00 |
| 1996 | 9.20 | 232.00 |
| 1997 | 7.40 | 245.00 |
| 1998 | 8.10 | 255.00 |
| 1999 | 7.70 | 261.00 |
| 2000 | 6.80 | 240.00 |
| 2001 | 6.60 | 233.00 |
| 2002 | 6.00 | 240.00 |
| 2003 | 6.00 | 248.00 |
| 2004 | 5.60 | 263.00 |
| 2005 | 4.40 | 272.00 |
| 2006 | 3.00 | 278.00 |
| 2007 | 2.60 | 352.00 |
| 2008 | 3.10 | 370.00 |
| 2009 | 3.70 | 368.00 |
| 2010 | 4.20 | 323.00 |
| 2011 | 4.60 | 332.00 |
| 2012 | 6.10 | 340.00 |
| 2013 | 6.70 | 346.00 |
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