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| year | production | consumption |
| 1980 | .00 | 259.00 |
| 1981 | .00 | 271.00 |
| 1982 | .00 | 331.00 |
| 1983 | .00 | 180.00 |
| 1984 | .00 | 68.00 |
| 1985 | .00 | 108.00 |
| 1986 | .00 | 163.00 |
| 1987 | .00 | 257.00 |
| 1988 | .00 | 265.00 |
| 1989 | .00 | 276.00 |
| 1990 | .00 | 621.00 |
| 1991 | .00 | 198.00 |
| 1992 | .00 | 186.00 |
| 1993 | .00 | 69.00 |
| 1994 | .00 | 65.00 |
| 1995 | .00 | 708.00 |
| 1996 | .00 | 388.00 |
| 1997 | .00 | 712.00 |
| 1998 | .00 | 205.00 |
| 1999 | .00 | 101.00 |
| 2000 | .00 | 728.00 |
| 2001 | .00 | 772.00 |
| 2002 | .00 | 806.00 |
| 2003 | 25.00 | 771.00 |
| 2004 | 71.00 | 772.00 |
| 2005 | 196.00 | 802.00 |
| 2006 | 334.00 | 1,066.00 |
| 2007 | 428.00 | 1,207.00 |
| 2008 | 746.00 | 1,458.00 |
| 2009 | 913.00 | 1,802.00 |
| 2010 | 777.00 | 1,792.00 |
| 2011 | 735.00 | 1,692.00 |
| 2012 | 920.00 | 1,994.00 |
| 2013 | 931.00 | 2,247.00 |
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