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| year | production | consumption |
| 1980 | 14.00 | 20.00 |
| 1981 | 13.00 | 21.00 |
| 1982 | 9.00 | 24.00 |
| 1983 | 9.00 | 12.00 |
| 1984 | 6.20 | 5.70 |
| 1985 | 5.10 | 5.20 |
| 1986 | 552.20 | 382.20 |
| 1987 | 504.70 | 339.40 |
| 1988 | 462.40 | 348.00 |
| 1989 | 471.40 | 310.40 |
| 1990 | 687.20 | 604.20 |
| 1991 | 683.10 | 593.10 |
| 1992 | 611.50 | 625.90 |
| 1993 | 624.80 | 713.20 |
| 1994 | 652.90 | 704.70 |
| 1995 | 703.10 | 735.20 |
| 1996 | 725.80 | 763.40 |
| 1997 | 823.90 | 858.90 |
| 1998 | 824.40 | 915.40 |
| 1999 | 851.60 | 961.60 |
| 2000 | 685.70 | 719.80 |
| 2001 | 964.90 | 844.30 |
| 2002 | 989.00 | 1,008.10 |
| 2003 | 972.70 | 995.10 |
| 2004 | 934.50 | 974.50 |
| 2005 | 932.90 | 970.70 |
| 2006 | 952.30 | 1,048.80 |
| 2007 | 982.60 | 1,044.80 |
| 2008 | 877.40 | 1,104.20 |
| 2009 | 939.80 | 1,241.10 |
| 2010 | 1,327.30 | 1,273.60 |
| 2011 | 1,264.90 | 1,226.10 |
| 2012 | 1,225.60 | 1,232.10 |
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