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| year | production | consumption |
| 1980 | 380.00 | 594.00 |
| 1981 | 394.00 | 584.00 |
| 1982 | 370.00 | 616.00 |
| 1983 | 416.00 | 594.00 |
| 1984 | 492.00 | 635.00 |
| 1985 | 575.00 | 639.00 |
| 1986 | 520.00 | 644.00 |
| 1987 | 547.00 | 661.00 |
| 1988 | 538.00 | 694.00 |
| 1989 | 490.00 | 723.00 |
| 1990 | 575.00 | 738.00 |
| 1991 | 545.00 | 721.00 |
| 1992 | 535.00 | 730.00 |
| 1993 | 503.00 | 761.00 |
| 1994 | 536.00 | 788.00 |
| 1995 | 562.00 | 811.00 |
| 1996 | 570.00 | 831.00 |
| 1997 | 588.00 | 848.00 |
| 1998 | 544.00 | 852.00 |
| 1999 | 539.00 | 875.00 |
| 2000 | 722.00 | 872.00 |
| 2001 | 657.00 | 872.00 |
| 2002 | 626.00 | 893.00 |
| 2003 | 512.00 | 926.00 |
| 2004 | 436.00 | 943.00 |
| 2005 | 446.00 | 964.00 |
| 2006 | 429.00 | 972.00 |
| 2007 | 465.00 | 988.00 |
| 2008 | 477.00 | 995.00 |
| 2009 | 475.00 | 987.00 |
| 2010 | 484.00 | 1,013.00 |
| 2011 | 414.00 | 1,056.00 |
| 2012 | 406.00 | 1,074.00 |
| 2013 | 338.00 | 1,080.00 |
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