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| year | production | consumption |
| 1992 | 36.00 | 65.00 |
| 1993 | 36.00 | 63.00 |
| 1994 | 39.00 | 79.00 |
| 1995 | 32.00 | 88.00 |
| 1996 | 30.00 | 78.00 |
| 1997 | 29.00 | 81.00 |
| 1998 | 31.00 | 90.00 |
| 1999 | 25.00 | 91.00 |
| 2000 | 24.00 | 86.00 |
| 2001 | 23.00 | 86.00 |
| 2002 | 22.00 | 89.00 |
| 2003 | 22.00 | 91.00 |
| 2004 | 20.00 | 95.00 |
| 2005 | 19.00 | 97.00 |
| 2006 | 17.00 | 99.00 |
| 2007 | 15.00 | 100.00 |
| 2008 | 14.00 | 95.00 |
| 2009 | 16.00 | 94.00 |
| 2010 | 15.00 | 80.00 |
| 2011 | 13.00 | 79.00 |
| 2012 | 12.00 | 73.00 |
| 2013 | 12.00 | 75.00 |
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