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| year | production | consumption |
| 1980 | 595.00 | 260.00 |
| 1981 | 598.00 | 300.00 |
| 1982 | 670.00 | 320.00 |
| 1983 | 727.00 | 376.00 |
| 1984 | 822.00 | 406.00 |
| 1985 | 887.00 | 430.00 |
| 1986 | 813.00 | 428.00 |
| 1987 | 896.00 | 442.00 |
| 1988 | 848.00 | 437.00 |
| 1989 | 865.00 | 443.00 |
| 1990 | 873.00 | 465.00 |
| 1991 | 874.00 | 456.00 |
| 1992 | 881.00 | 444.00 |
| 1993 | 890.00 | 439.00 |
| 1994 | 896.00 | 430.00 |
| 1995 | 920.00 | 448.00 |
| 1996 | 922.00 | 486.00 |
| 1997 | 856.00 | 531.00 |
| 1998 | 834.00 | 545.00 |
| 1999 | 852.00 | 554.00 |
| 2000 | 768.00 | 539.00 |
| 2001 | 720.00 | 545.00 |
| 2002 | 715.00 | 565.00 |
| 2003 | 713.00 | 561.00 |
| 2004 | 673.00 | 604.00 |
| 2005 | 623.00 | 658.00 |
| 2006 | 535.00 | 689.00 |
| 2007 | 530.00 | 715.00 |
| 2008 | 566.00 | 708.00 |
| 2009 | 587.00 | 712.00 |
| 2010 | 568.00 | 706.00 |
| 2011 | 551.00 | 710.00 |
| 2012 | 539.00 | 743.00 |
| 2013 | 514.00 | 752.00 |
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