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| year | production | consumption |
| 1980 | 82.00 | 82.00 |
| 1981 | 81.70 | 81.70 |
| 1982 | 102.70 | 102.70 |
| 1983 | 127.70 | 127.70 |
| 1984 | 192.50 | 192.50 |
| 1985 | 216.60 | 216.60 |
| 1986 | 152.60 | 152.60 |
| 1987 | 144.10 | 144.20 |
| 1988 | 155.60 | 155.60 |
| 1989 | 164.10 | 164.10 |
| 1990 | 179.10 | 179.10 |
| 1991 | 203.00 | 203.00 |
| 1992 | 196.00 | 196.00 |
| 1993 | 220.40 | 220.40 |
| 1994 | 252.00 | 252.00 |
| 1995 | 270.30 | 270.30 |
| 1996 | 305.50 | 305.50 |
| 1997 | 355.00 | 355.00 |
| 1998 | 343.00 | 343.00 |
| 1999 | 433.00 | 356.00 |
| 2000 | 515.00 | 388.00 |
| 2001 | 548.00 | 431.00 |
| 2002 | 624.00 | 458.00 |
| 2003 | 888.00 | 504.00 |
| 2004 | 1,006.00 | 542.60 |
| 2005 | 1,084.00 | 622.80 |
| 2006 | 1,302.00 | 761.80 |
| 2007 | 1,400.00 | 780.00 |
| 2008 | 1,430.10 | 862.10 |
| 2009 | 1,478.70 | 828.70 |
| 2010 | 1,537.70 | 918.70 |
| 2011 | 1,470.70 | 906.70 |
| 2012 | 1,545.70 | 836.70 |
| 2013 | 1,548.70 | 858.70 |
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