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| year | production | consumption |
| 1993 | 16.00 | 11.00 |
| 1994 | 16.00 | 11.00 |
| 1995 | 19.00 | 12.00 |
| 1996 | 19.00 | 11.00 |
| 1997 | 19.00 | 15.00 |
| 1998 | 21.00 | 15.00 |
| 1999 | 24.00 | 15.00 |
| 2000 | 32.00 | 14.00 |
| 2001 | 33.00 | 14.00 |
| 2002 | 36.00 | 17.00 |
| 2003 | 37.00 | 15.00 |
| 2004 | 39.00 | 14.00 |
| 2005 | 39.00 | 15.00 |
| 2006 | 35.00 | 14.00 |
| 2007 | 38.00 | 15.00 |
| 2008 | 36.00 | 16.00 |
| 2009 | 35.00 | 15.00 |
| 2010 | 29.00 | 14.00 |
| 2011 | 33.00 | 14.00 |
| 2012 | 32.00 | 13.00 |
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