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| year | production | consumption |
| 1986 | 8.00 | 10.00 |
| 1987 | 8.40 | 10.00 |
| 1988 | 7.90 | 12.00 |
| 1989 | 8.30 | 13.00 |
| 1990 | 6.10 | 13.00 |
| 1991 | 6.40 | 11.00 |
| 1992 | 6.10 | 13.00 |
| 1993 | 5.80 | 13.00 |
| 1994 | 8.20 | 14.00 |
| 1995 | 7.40 | 12.00 |
| 1996 | 8.40 | 14.00 |
| 1997 | 8.60 | 15.00 |
| 1998 | 8.80 | 15.00 |
| 1999 | 6.90 | 20.00 |
| 2000 | 5.90 | 27.00 |
| 2001 | 5.40 | 23.00 |
| 2002 | 6.30 | 25.00 |
| 2003 | 6.60 | 23.00 |
| 2004 | 10.00 | 25.00 |
| 2005 | 10.00 | 24.00 |
| 2006 | 10.00 | 23.00 |
| 2007 | 9.40 | 22.00 |
| 2008 | 9.00 | 21.00 |
| 2009 | 5.90 | 20.00 |
| 2010 | 6.30 | 23.00 |
| 2011 | 3.30 | 24.00 |
| 2012 | 3.00 | 27.00 |
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