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| year | production | consumption |
| 1992 | 13.00 | 13.00 |
| 1993 | 13.00 | 20.00 |
| 1994 | 17.00 | 20.00 |
| 1995 | 19.00 | 21.00 |
| 1996 | 21.00 | 20.00 |
| 1997 | 2.20 | 7.10 |
| 1998 | 2.20 | 3.80 |
| 1999 | 1.20 | 1.20 |
| 2000 | 1.30 | 2.60 |
| 2001 | 7.90 | 17.00 |
| 2002 | 34.00 | 21.00 |
| 2003 | 31.00 | 25.00 |
| 2004 | 42.00 | 14.00 |
| 2005 | 36.00 | 17.00 |
| 2006 | 44.00 | 19.00 |
| 2007 | 40.00 | 11.00 |
| 2008 | 43.00 | 9.70 |
| 2009 | 55.00 | 11.00 |
| 2010 | 27.00 | 10.00 |
| 2011 | 26.00 | 14.00 |
| 2012 | 27.00 | 11.00 |
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