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| year | production | consumption |
| 1992 | .00 | 44.00 |
| 1993 | .00 | 25.00 |
| 1994 | .00 | 18.00 |
| 1995 | .00 | 25.00 |
| 1996 | .00 | 28.00 |
| 1997 | .00 | 31.00 |
| 1998 | .00 | 32.00 |
| 1999 | .00 | 33.00 |
| 2000 | .00 | 35.00 |
| 2001 | .00 | 37.00 |
| 2002 | .00 | 39.00 |
| 2003 | .00 | 40.00 |
| 2004 | .00 | 41.00 |
| 2005 | .00 | 44.00 |
| 2006 | .00 | 45.00 |
| 2007 | .00 | 47.00 |
| 2008 | .00 | 47.00 |
| 2009 | .00 | 46.00 |
| 2010 | .00 | 9.00 |
| 2011 | .00 | 8.50 |
| 2012 | .00 | 8.70 |
| 2013 | .00 | 8.70 |
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