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| year | production | consumption |
| 1992 | .00 | 4.20 |
| 1993 | .00 | 2.00 |
| 1994 | .00 | 1.80 |
| 1995 | .00 | 2.20 |
| 1996 | .00 | 2.70 |
| 1997 | .00 | 3.00 |
| 1998 | .00 | 3.30 |
| 1999 | .00 | .60 |
| 2000 | .00 | 1.30 |
| 2001 | .00 | 13.00 |
| 2002 | .00 | 14.00 |
| 2003 | .00 | 15.00 |
| 2004 | .00 | 15.00 |
| 2005 | .00 | 17.00 |
| 2006 | .00 | 17.00 |
| 2007 | .00 | 17.00 |
| 2008 | .00 | 2.60 |
| 2009 | .00 | 17.00 |
| 2010 | .00 | 2.70 |
| 2011 | .00 | 2.80 |
| 2012 | .00 | 3.00 |
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