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| year | production | consumption |
| 1986 | 11.00 | 11.00 |
| 1987 | 12.00 | 10.00 |
| 1988 | 11.00 | 12.00 |
| 1989 | 11.00 | 12.00 |
| 1990 | 12.00 | 12.00 |
| 1991 | 11.00 | 9.30 |
| 1992 | 12.00 | 12.00 |
| 1993 | 11.00 | 12.00 |
| 1994 | 11.00 | 11.00 |
| 1995 | 9.70 | 14.00 |
| 1996 | 8.60 | 14.00 |
| 1997 | 8.40 | 14.00 |
| 1998 | 8.80 | 13.00 |
| 1999 | 8.80 | 12.00 |
| 2000 | 10.00 | 14.00 |
| 2001 | 8.90 | 12.00 |
| 2002 | 8.30 | 13.00 |
| 2003 | 8.40 | 15.00 |
| 2004 | 7.90 | 20.00 |
| 2005 | 7.70 | 20.00 |
| 2006 | 7.50 | 22.00 |
| 2007 | 8.10 | 23.00 |
| 2008 | 7.60 | 24.00 |
| 2009 | 8.00 | 29.00 |
| 2010 | 8.00 | 27.00 |
| 2011 | 8.80 | 31.00 |
| 2012 | 4.90 | 31.00 |
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