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| year | production | consumption |
| 1986 | 8.80 | 5.60 |
| 1987 | 5.50 | 5.50 |
| 1988 | 5.30 | 6.30 |
| 1989 | 6.40 | 6.50 |
| 1990 | 6.40 | 6.40 |
| 1991 | 7.10 | 7.10 |
| 1992 | 6.90 | 6.90 |
| 1993 | 6.10 | 6.50 |
| 1994 | 8.30 | 8.40 |
| 1995 | 8.20 | 8.50 |
| 1996 | 7.00 | 11.00 |
| 1997 | 9.50 | 15.00 |
| 1998 | 9.20 | 17.00 |
| 1999 | 9.00 | 24.00 |
| 2000 | 8.70 | 22.00 |
| 2001 | 7.50 | 18.00 |
| 2002 | 8.80 | 20.00 |
| 2003 | 6.00 | 21.00 |
| 2004 | 6.20 | 25.00 |
| 2005 | 6.70 | 26.00 |
| 2006 | 5.60 | 23.00 |
| 2007 | 5.20 | 23.00 |
| 2008 | 5.00 | 16.00 |
| 2009 | 4.30 | 12.00 |
| 2010 | 4.90 | 10.00 |
| 2011 | 3.40 | 8.80 |
| 2012 | 3.40 | 3.80 |
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