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| year | production | consumption |
| 1980 | 443.00 | 972.00 |
| 1981 | 496.00 | 942.00 |
| 1982 | 515.00 | 944.00 |
| 1983 | 461.00 | 967.00 |
| 1984 | 489.00 | 1,135.00 |
| 1985 | 503.00 | 1,151.00 |
| 1986 | 564.00 | 1,217.00 |
| 1987 | 576.00 | 1,346.00 |
| 1988 | 587.00 | 1,460.00 |
| 1989 | 600.00 | 1,581.00 |
| 1990 | 611.00 | 1,674.00 |
| 1991 | 614.00 | 1,775.00 |
| 1992 | 641.00 | 1,760.00 |
| 1993 | 691.00 | 1,801.00 |
| 1994 | 729.00 | 1,748.00 |
| 1995 | 720.00 | 1,921.00 |
| 1996 | 708.00 | 1,984.00 |
| 1997 | 680.00 | 2,048.00 |
| 1998 | 671.00 | 2,205.00 |
| 1999 | 617.00 | 2,396.00 |
| 2000 | 587.00 | 2,498.00 |
| 2001 | 538.00 | 2,505.00 |
| 2002 | 516.00 | 2,488.00 |
| 2003 | 490.00 | 2,743.00 |
| 2004 | 458.00 | 2,847.00 |
| 2005 | 426.00 | 3,046.00 |
| 2006 | 388.00 | 2,984.00 |
| 2007 | 343.00 | 2,998.00 |
| 2008 | 327.00 | 2,998.00 |
| 2009 | 283.00 | 2,755.00 |
| 2010 | 297.00 | 2,935.00 |
| 2011 | 298.00 | 2,752.00 |
| 2012 | 304.00 | 2,646.00 |
| 2013 | 273.00 | 2,474.00 |
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