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| year | production | consumption |
| 1980 | 23.00 | 25.00 |
| 1981 | 24.00 | 27.00 |
| 1982 | 18.00 | 25.00 |
| 1983 | 22.00 | 27.00 |
| 1984 | 23.00 | 25.00 |
| 1985 | 23.00 | 24.00 |
| 1986 | 725.80 | 739.90 |
| 1987 | 723.90 | 750.70 |
| 1988 | 772.40 | 756.90 |
| 1989 | 760.50 | 784.50 |
| 1990 | 765.30 | 636.30 |
| 1991 | 736.40 | 675.20 |
| 1992 | 856.20 | 701.60 |
| 1993 | 953.30 | 729.00 |
| 1994 | 978.60 | 754.60 |
| 1995 | 947.30 | 791.00 |
| 1996 | 1,060.40 | 866.00 |
| 1997 | 1,122.70 | 871.20 |
| 1998 | 1,142.50 | 855.20 |
| 1999 | 1,087.30 | 833.50 |
| 2000 | 1,270.80 | 1,131.60 |
| 2001 | 1,102.70 | 1,029.60 |
| 2002 | 1,035.50 | 773.60 |
| 2003 | 992.70 | 800.50 |
| 2004 | 1,056.20 | 765.50 |
| 2005 | 1,159.60 | 825.60 |
| 2006 | 1,092.10 | 858.00 |
| 2007 | 1,063.10 | 924.30 |
| 2008 | 1,057.00 | 934.30 |
| 2009 | 1,091.10 | 905.70 |
| 2010 | 1,052.00 | 1,001.30 |
| 2011 | 1,071.20 | 1,095.00 |
| 2012 | 1,104.00 | 1,225.30 |
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