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| year | production | consumption |
| 1986 | 3.90 | 3.30 |
| 1987 | 5.00 | 3.10 |
| 1988 | 1.50 | 4.40 |
| 1989 | 3.10 | 6.30 |
| 1990 | 4.20 | 6.70 |
| 1991 | 3.20 | 5.50 |
| 1992 | 4.60 | 6.10 |
| 1993 | 3.20 | 6.50 |
| 1994 | 3.60 | 9.00 |
| 1995 | 3.90 | 9.60 |
| 1996 | 5.40 | 11.00 |
| 1997 | 5.60 | 9.60 |
| 1998 | 5.90 | 11.00 |
| 1999 | 2.90 | 12.00 |
| 2000 | 3.80 | 6.10 |
| 2001 | 3.50 | 6.80 |
| 2002 | 5.00 | 8.50 |
| 2003 | 3.20 | 11.00 |
| 2004 | 1.70 | 11.00 |
| 2005 | 1.80 | 11.00 |
| 2006 | 4.60 | 16.00 |
| 2007 | 3.90 | 18.00 |
| 2008 | 5.40 | 12.00 |
| 2009 | 3.50 | 10.00 |
| 2010 | 3.90 | 9.30 |
| 2011 | 4.30 | 10.00 |
| 2012 | 4.50 | 9.30 |
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