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| year | production | consumption |
| 1986 | 12.00 | 14.00 |
| 1987 | 12.00 | 14.00 |
| 1988 | 12.00 | 14.00 |
| 1989 | 11.00 | 13.00 |
| 1990 | 12.00 | 15.00 |
| 1991 | 12.00 | 16.00 |
| 1992 | 7.00 | 13.00 |
| 1993 | 5.90 | 13.00 |
| 1994 | 7.90 | 14.00 |
| 1995 | 7.40 | 13.00 |
| 1996 | 3.90 | 9.70 |
| 1997 | 4.70 | 9.80 |
| 1998 | 6.60 | 12.00 |
| 1999 | 9.10 | 15.00 |
| 2000 | 11.00 | 15.00 |
| 2001 | 2.30 | 11.00 |
| 2002 | 2.30 | 13.00 |
| 2003 | 2.30 | 13.00 |
| 2004 | 2.30 | 12.00 |
| 2005 | 1.90 | 8.70 |
| 2006 | 1.50 | 6.70 |
| 2007 | 1.60 | 7.90 |
| 2008 | 1.70 | 8.10 |
| 2009 | 1.40 | 6.20 |
| 2010 | 2.10 | 6.80 |
| 2011 | 2.10 | 7.10 |
| 2012 | 2.10 | 7.10 |
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