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| year | production | consumption |
| 1992 | 155.00 | 581.00 |
| 1993 | 165.00 | 313.00 |
| 1994 | 203.00 | 457.00 |
| 1995 | 37.00 | 51.00 |
| 1996 | 18.00 | 22.00 |
| 1997 | 5.50 | 13.00 |
| 1998 | 17.00 | 40.00 |
| 1999 | 18.00 | 31.00 |
| 2000 | 7.70 | 39.00 |
| 2001 | 1.10 | 4.00 |
| 2002 | 6.60 | 6.60 |
| 2003 | 8.80 | 13.00 |
| 2004 | 8.80 | 15.00 |
| 2005 | 5.50 | 20.00 |
| 2006 | 9.90 | 18.00 |
| 2007 | 15.00 | 21.00 |
| 2008 | 12.00 | 130.00 |
| 2009 | 168.00 | 249.00 |
| 2010 | 116.00 | 190.00 |
| 2011 | 154.00 | 162.00 |
| 2012 | 280.00 | 284.00 |
| 2013 | 445.00 | 471.00 |
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