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| year | production | consumption |
| 1986 | 7.60 | 19.00 |
| 1987 | 7.30 | 19.00 |
| 1988 | 7.30 | 20.00 |
| 1989 | 8.40 | 22.00 |
| 1990 | 10.00 | 26.00 |
| 1991 | 11.00 | 20.00 |
| 1992 | 10.00 | 13.00 |
| 1993 | 11.00 | 14.00 |
| 1994 | 10.00 | 13.00 |
| 1995 | 9.80 | 13.00 |
| 1996 | 11.00 | 13.00 |
| 1997 | 8.70 | 11.00 |
| 1998 | 10.00 | 11.00 |
| 1999 | 7.40 | 11.00 |
| 2000 | 9.10 | 9.40 |
| 2001 | 7.70 | 7.50 |
| 2002 | 6.00 | 6.60 |
| 2003 | 5.10 | 5.50 |
| 2004 | 4.30 | 4.30 |
| 2005 | 6.30 | 6.30 |
| 2006 | 4.40 | 4.50 |
| 2007 | 4.60 | 4.80 |
| 2008 | 3.70 | 4.00 |
| 2009 | 2.90 | 3.50 |
| 2010 | 2.60 | 5.20 |
| 2011 | 2.80 | 3.20 |
| 2012 | 3.40 | 3.50 |
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