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| year | production | consumption |
| 1986 | 9.70 | 22.00 |
| 1987 | 9.40 | 20.00 |
| 1988 | 9.80 | 20.00 |
| 1989 | 8.90 | 20.00 |
| 1990 | 11.00 | 20.00 |
| 1991 | 11.00 | 21.00 |
| 1992 | 9.80 | 24.00 |
| 1993 | 10.00 | 25.00 |
| 1994 | 10.00 | 25.00 |
| 1995 | 11.00 | 25.00 |
| 1996 | 12.00 | 27.00 |
| 1997 | 12.00 | 30.00 |
| 1998 | 11.00 | 31.00 |
| 1999 | 10.00 | 32.00 |
| 2000 | 11.00 | 33.00 |
| 2001 | 9.60 | 35.00 |
| 2002 | 9.60 | 35.00 |
| 2003 | 10.00 | 36.00 |
| 2004 | 8.80 | 37.00 |
| 2005 | 9.90 | 32.00 |
| 2006 | 10.00 | 37.00 |
| 2007 | 11.00 | 37.00 |
| 2008 | 11.00 | 36.00 |
| 2009 | 12.00 | 37.00 |
| 2010 | 1.70 | 35.00 |
| 2011 | 5.20 | 33.00 |
| 2012 | 14.00 | 34.00 |
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