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| year | production | consumption |
| 1986 | 4.60 | 7.00 |
| 1987 | 1.70 | 7.60 |
| 1988 | 4.20 | 9.20 |
| 1989 | 4.00 | 10.00 |
| 1990 | 4.80 | 11.00 |
| 1991 | 6.00 | 12.00 |
| 1992 | 7.10 | 14.00 |
| 1993 | 8.40 | 14.00 |
| 1994 | 8.10 | 16.00 |
| 1995 | 7.00 | 18.00 |
| 1996 | 8.30 | 18.00 |
| 1997 | 6.50 | 20.00 |
| 1998 | 4.00 | 17.00 |
| 1999 | 5.90 | 20.00 |
| 2000 | 7.90 | 21.00 |
| 2001 | 4.10 | 22.00 |
| 2002 | 3.40 | 20.00 |
| 2003 | 4.00 | 22.00 |
| 2004 | 4.30 | 22.00 |
| 2005 | 6.40 | 23.00 |
| 2006 | 8.00 | 21.00 |
| 2007 | 3.80 | 32.00 |
| 2008 | 5.70 | 33.00 |
| 2009 | 6.10 | 31.00 |
| 2010 | 5.70 | 33.00 |
| 2011 | 4.80 | 32.00 |
| 2012 | 5.00 | 33.00 |
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