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| year | production | consumption |
| 1980 | 24.80 | 25.80 |
| 1981 | 20.00 | 3.00 |
| 1982 | 19.00 | 4.00 |
| 1983 | 19.00 | 4.00 |
| 1984 | 404.30 | 596.20 |
| 1985 | 384.60 | 589.80 |
| 1986 | 435.50 | 633.60 |
| 1987 | 446.70 | 710.60 |
| 1988 | 470.30 | 699.20 |
| 1989 | 483.90 | 693.40 |
| 1990 | 498.80 | 716.30 |
| 1991 | 568.00 | 861.50 |
| 1992 | 877.70 | 1,124.60 |
| 1993 | 804.90 | 1,031.70 |
| 1994 | 801.20 | 1,061.10 |
| 1995 | 821.40 | 1,112.20 |
| 1996 | 816.00 | 1,120.10 |
| 1997 | 838.90 | 1,141.00 |
| 1998 | 827.60 | 1,120.40 |
| 1999 | 835.90 | 1,165.30 |
| 2000 | 909.10 | 1,188.30 |
| 2001 | 885.00 | 1,267.20 |
| 2002 | 970.30 | 1,279.20 |
| 2003 | 1,022.00 | 1,309.40 |
| 2004 | 1,033.00 | 1,339.20 |
| 2005 | 1,062.50 | 1,377.00 |
| 2006 | 1,086.00 | 1,383.50 |
| 2007 | 993.90 | 1,574.90 |
| 2008 | 1,013.80 | 1,566.70 |
| 2009 | 1,026.00 | 1,539.60 |
| 2010 | 1,048.20 | 1,540.30 |
| 2011 | 1,068.30 | 1,572.00 |
| 2012 | 1,093.80 | 1,552.50 |
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