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| year | production | consumption |
| 1992 | 4.00 | 3.20 |
| 1993 | 5.20 | 3.30 |
| 1994 | 5.00 | 3.50 |
| 1995 | 5.40 | 2.60 |
| 1996 | 7.50 | 2.60 |
| 1997 | 8.30 | 3.20 |
| 1998 | 7.00 | 3.60 |
| 1999 | 5.50 | 4.70 |
| 2000 | 4.90 | 6.00 |
| 2001 | 6.60 | 7.20 |
| 2002 | 15.00 | 8.20 |
| 2003 | 14.00 | 9.30 |
| 2004 | 17.00 | 11.00 |
| 2005 | 17.00 | 11.00 |
| 2006 | 13.00 | 8.90 |
| 2007 | 9.10 | 8.10 |
| 2008 | 15.00 | 9.50 |
| 2009 | 12.00 | 9.50 |
| 2010 | 12.00 | 9.50 |
| 2011 | 11.00 | 8.90 |
| 2012 | 9.80 | 8.80 |
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