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| year | production | consumption |
| 1986 | 9.40 | 9.40 |
| 1987 | 9.00 | 9.00 |
| 1988 | 8.90 | 8.90 |
| 1989 | 14.00 | 14.00 |
| 1990 | 7.70 | 7.70 |
| 1991 | 7.50 | 7.10 |
| 1992 | 7.60 | 7.00 |
| 1993 | 8.20 | 13.00 |
| 1994 | 8.60 | 8.50 |
| 1995 | 9.30 | 9.20 |
| 1996 | 8.70 | 8.40 |
| 1997 | 8.00 | 8.20 |
| 1998 | 10.00 | 9.70 |
| 1999 | 8.60 | 9.10 |
| 2000 | 11.00 | 9.20 |
| 2001 | 11.00 | 10.00 |
| 2002 | 11.00 | 11.00 |
| 2003 | 10.00 | 11.00 |
| 2004 | 12.00 | 13.00 |
| 2005 | 21.00 | 17.00 |
| 2006 | 22.00 | 20.00 |
| 2007 | 24.00 | 23.00 |
| 2008 | 19.00 | 18.00 |
| 2009 | 24.00 | 20.00 |
| 2010 | 18.00 | 15.00 |
| 2011 | 18.00 | 14.00 |
| 2012 | 17.00 | 14.00 |
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