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| year | production | consumption |
| 1993 | 26.00 | 16.00 |
| 1994 | 24.00 | 15.00 |
| 1995 | 19.00 | 10.00 |
| 1996 | 20.00 | 11.00 |
| 1997 | 20.00 | 11.00 |
| 1998 | 22.00 | 11.00 |
| 1999 | 21.00 | 7.10 |
| 2000 | 9.60 | 3.40 |
| 2001 | 14.00 | 7.20 |
| 2002 | 11.00 | 6.70 |
| 2003 | 11.00 | 7.00 |
| 2004 | 11.00 | 5.30 |
| 2005 | 11.00 | 6.20 |
| 2006 | 12.00 | 7.40 |
| 2007 | 9.30 | 6.40 |
| 2008 | 8.40 | 6.00 |
| 2009 | 10.00 | 5.70 |
| 2010 | 9.80 | 6.40 |
| 2011 | 6.00 | 5.70 |
| 2012 | 8.10 | 6.20 |
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