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| year | production | consumption |
| 1986 | 11.00 | 2.60 |
| 1987 | 11.00 | 2.80 |
| 1988 | 13.00 | 2.00 |
| 1989 | 12.00 | .70 |
| 1990 | 13.00 | 3.00 |
| 1991 | 14.00 | 3.60 |
| 1992 | 19.00 | 6.30 |
| 1993 | 19.00 | 5.60 |
| 1994 | 18.00 | 2.60 |
| 1995 | 20.00 | 3.80 |
| 1996 | 21.00 | 4.00 |
| 1997 | 23.00 | 5.30 |
| 1998 | 23.00 | 5.10 |
| 1999 | 34.00 | 5.00 |
| 2000 | 35.00 | 5.80 |
| 2001 | 34.00 | 5.90 |
| 2002 | 32.00 | 6.70 |
| 2003 | 31.00 | 5.70 |
| 2004 | 29.00 | 7.60 |
| 2005 | 30.00 | 8.00 |
| 2006 | 37.00 | 5.50 |
| 2007 | 35.00 | 7.50 |
| 2008 | 37.00 | 12.00 |
| 2009 | 35.00 | 10.00 |
| 2010 | 29.00 | 13.00 |
| 2011 | 28.00 | 12.00 |
| 2012 | 19.00 | 13.00 |
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