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Loading...
| year | production | consumption |
| 1980 | 3.00 | 1.00 |
| 1981 | 8.00 | 7.00 |
| 1982 | 7.00 | 7.00 |
| 1983 | 7.00 | 7.00 |
| 1984 | 6.20 | 6.10 |
| 1985 | 5.40 | 5.20 |
| 1986 | 123.00 | 125.10 |
| 1987 | 120.60 | 123.90 |
| 1988 | 117.40 | 126.50 |
| 1989 | 123.40 | 133.00 |
| 1990 | 131.40 | 140.30 |
| 1991 | 127.30 | 144.00 |
| 1992 | 139.50 | 149.80 |
| 1993 | 142.70 | 153.40 |
| 1994 | 144.80 | 157.60 |
| 1995 | 148.60 | 138.50 |
| 1996 | 149.10 | 151.60 |
| 1997 | 148.70 | 158.60 |
| 1998 | 130.10 | 156.10 |
| 1999 | 165.00 | 208.60 |
| 2000 | 169.10 | 211.70 |
| 2001 | 162.90 | 207.40 |
| 2002 | 158.90 | 205.20 |
| 2003 | 164.00 | 202.90 |
| 2004 | 158.10 | 205.90 |
| 2005 | 163.90 | 198.40 |
| 2006 | 154.00 | 184.60 |
| 2007 | 144.20 | 163.40 |
| 2008 | 132.40 | 138.40 |
| 2009 | 81.00 | 100.60 |
| 2010 | 55.40 | 52.30 |
| 2011 | 39.30 | 33.50 |
| 2012 | 30.20 | 25.30 |
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