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| year | production | consumption |
| 1986 | 6.30 | 5.10 |
| 1987 | 6.90 | 7.50 |
| 1988 | 7.20 | 9.60 |
| 1989 | 8.70 | 8.50 |
| 1990 | 8.80 | 5.80 |
| 1991 | 5.50 | 3.60 |
| 1992 | 5.60 | 3.10 |
| 1993 | 7.60 | 3.60 |
| 1994 | 9.80 | 3.20 |
| 1995 | 11.00 | 3.30 |
| 1996 | 12.00 | 3.60 |
| 1997 | 14.00 | 3.80 |
| 1998 | 15.00 | 3.80 |
| 1999 | 16.00 | 3.90 |
| 2000 | 13.00 | 3.90 |
| 2001 | 11.00 | 2.80 |
| 2002 | 11.00 | 3.80 |
| 2003 | 8.40 | 1.80 |
| 2004 | 14.00 | 2.60 |
| 2005 | 12.00 | 4.20 |
| 2006 | 14.00 | 3.20 |
| 2007 | 13.00 | 2.50 |
| 2008 | 11.00 | 3.10 |
| 2009 | 10.00 | 2.90 |
| 2010 | 11.00 | 3.80 |
| 2011 | 9.10 | 3.20 |
| 2012 | 13.00 | 3.30 |
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