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| year | production | consumption |
| 1992 | 21.00 | 16.00 |
| 1993 | 31.00 | 11.00 |
| 1994 | 24.00 | 10.00 |
| 1995 | 20.00 | 15.00 |
| 1996 | 30.00 | 15.00 |
| 1997 | 39.00 | 15.00 |
| 1998 | 49.00 | 15.00 |
| 1999 | 32.00 | 12.00 |
| 2000 | 29.00 | 15.00 |
| 2001 | 49.00 | 23.00 |
| 2002 | 40.00 | 17.00 |
| 2003 | 44.00 | 7.20 |
| 2004 | 54.00 | 6.40 |
| 2005 | 58.00 | 9.00 |
| 2006 | 55.00 | 10.00 |
| 2007 | 38.00 | 9.50 |
| 2008 | 63.00 | 8.00 |
| 2009 | 60.00 | 6.20 |
| 2010 | 63.00 | 4.60 |
| 2011 | 63.00 | 3.90 |
| 2012 | 59.00 | 3.30 |
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