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| year | production | consumption |
| 1992 | 28.00 | 28.00 |
| 1993 | 9.30 | 7.20 |
| 1994 | 5.30 | 5.30 |
| 1995 | 7.00 | 41.00 |
| 1996 | 5.40 | 54.00 |
| 1997 | 5.00 | 51.00 |
| 1998 | 5.30 | 48.00 |
| 1999 | 5.20 | 42.00 |
| 2000 | 3.70 | 40.00 |
| 2001 | 13.00 | 9.80 |
| 2002 | 21.00 | 15.00 |
| 2003 | 24.00 | 16.00 |
| 2004 | 25.00 | 16.00 |
| 2005 | 23.00 | 16.00 |
| 2006 | 25.00 | 21.00 |
| 2007 | 35.00 | 32.00 |
| 2008 | 23.00 | 23.00 |
| 2009 | 24.00 | 25.00 |
| 2010 | 22.00 | 24.00 |
| 2011 | 21.00 | 25.00 |
| 2012 | 18.00 | 26.00 |
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