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| year | production | consumption |
| 1986 | 3.80 | 4.50 |
| 1987 | 3.10 | 3.30 |
| 1988 | 3.20 | 4.00 |
| 1989 | 4.70 | 4.70 |
| 1990 | 4.80 | 4.80 |
| 1991 | 4.80 | 4.00 |
| 1992 | 4.50 | 4.30 |
| 1993 | 5.20 | 6.00 |
| 1994 | 4.60 | 4.10 |
| 1995 | 5.60 | 5.10 |
| 1996 | 5.70 | 5.20 |
| 1997 | 4.70 | 6.00 |
| 1998 | 4.40 | 5.90 |
| 1999 | 4.50 | 5.60 |
| 2000 | 3.80 | 4.00 |
| 2001 | 2.80 | 5.20 |
| 2002 | 4.50 | 3.70 |
| 2003 | 4.30 | 4.90 |
| 2004 | 4.70 | 5.10 |
| 2005 | 4.80 | 5.20 |
| 2006 | 4.40 | 7.20 |
| 2007 | 5.30 | 8.50 |
| 2008 | 6.70 | 11.00 |
| 2009 | 3.60 | 7.30 |
| 2010 | 6.10 | 9.50 |
| 2011 | 6.10 | 9.70 |
| 2012 | 5.90 | 9.70 |
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