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| year | production | consumption |
| 1993 | 29.00 | 37.00 |
| 1994 | 30.00 | 32.00 |
| 1995 | 26.00 | 23.00 |
| 1996 | 29.00 | 25.00 |
| 1997 | 27.00 | 23.00 |
| 1998 | 27.00 | 25.00 |
| 1999 | 20.00 | 22.00 |
| 2000 | 16.00 | 16.00 |
| 2001 | 14.00 | 16.00 |
| 2002 | 6.60 | 9.40 |
| 2003 | 7.90 | 9.20 |
| 2004 | 6.90 | 9.80 |
| 2005 | 10.00 | 9.50 |
| 2006 | 6.70 | 7.60 |
| 2007 | 7.40 | 7.20 |
| 2008 | 5.90 | 6.10 |
| 2009 | 4.60 | 5.60 |
| 2010 | 4.20 | 4.20 |
| 2011 | 3.40 | 3.00 |
| 2012 | 2.60 | 2.00 |
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