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| year | production | consumption |
| 1992 | 61.00 | 56.00 |
| 1993 | 84.00 | 83.00 |
| 1994 | 78.00 | 77.00 |
| 1995 | 81.00 | 65.00 |
| 1996 | 75.00 | 74.00 |
| 1997 | 73.00 | 59.00 |
| 1998 | 76.00 | 78.00 |
| 1999 | 73.00 | 76.00 |
| 2000 | 48.00 | 43.00 |
| 2001 | 46.00 | 41.00 |
| 2002 | 45.00 | 42.00 |
| 2003 | 47.00 | 44.00 |
| 2004 | 41.00 | 41.00 |
| 2005 | 47.00 | 35.00 |
| 2006 | 58.00 | 44.00 |
| 2007 | 47.00 | 29.00 |
| 2008 | 29.00 | 13.00 |
| 2009 | 6.70 | 6.30 |
| 2010 | 5.90 | 3.10 |
| 2011 | 6.30 | 4.20 |
| 2012 | 6.90 | 4.20 |
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