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| year | production | consumption |
| 1992 | .80 | 18.00 |
| 1993 | .00 | 14.00 |
| 1994 | .00 | 15.00 |
| 1995 | 32.00 | 87.00 |
| 1996 | .00 | 4.90 |
| 1997 | .00 | 4.90 |
| 1998 | .00 | 7.10 |
| 1999 | .00 | 7.10 |
| 2000 | .00 | 11.00 |
| 2001 | .00 | 11.00 |
| 2002 | .00 | 5.70 |
| 2003 | .00 | 5.70 |
| 2004 | .00 | 11.00 |
| 2005 | .00 | 14.00 |
| 2006 | .00 | 14.00 |
| 2007 | .00 | 11.00 |
| 2008 | .00 | 11.00 |
| 2009 | .00 | 7.40 |
| 2010 | .00 | 8.10 |
| 2011 | .00 | 9.90 |
| 2012 | .00 | 8.50 |
| 2013 | .00 | 8.50 |
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