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| year | production | consumption |
| 1992 | 2.90 | 27.00 |
| 1993 | 2.00 | 16.00 |
| 1994 | 1.80 | 7.50 |
| 1995 | 1.00 | 8.00 |
| 1996 | 1.20 | 14.00 |
| 1997 | 2.70 | 16.00 |
| 1998 | 2.20 | 16.00 |
| 1999 | 2.20 | 17.00 |
| 2000 | 2.00 | 16.00 |
| 2001 | 2.00 | 13.00 |
| 2002 | 1.50 | 12.00 |
| 2003 | 2.80 | 12.00 |
| 2004 | 2.00 | 13.00 |
| 2005 | 2.00 | 15.00 |
| 2006 | 1.00 | 16.00 |
| 2007 | 1.00 | 18.00 |
| 2008 | 1.00 | 19.00 |
| 2009 | 1.00 | 20.00 |
| 2010 | 1.00 | 21.00 |
| 2011 | 1.00 | 22.00 |
| 2012 | 1.00 | 22.00 |
| 2013 | 1.00 | 21.00 |
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