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| year | production | consumption |
| 1992 | 25.00 | 25.00 |
| 1993 | 11.00 | 15.00 |
| 1994 | 12.00 | 8.90 |
| 1995 | 12.00 | 9.60 |
| 1996 | 10.00 | 3.20 |
| 1997 | 2.80 | 2.10 |
| 1998 | 3.80 | 3.60 |
| 1999 | 11.00 | 3.30 |
| 2000 | 3.70 | 3.70 |
| 2001 | 6.60 | 1.70 |
| 2002 | 3.00 | 3.10 |
| 2003 | 3.00 | 3.00 |
| 2004 | 3.00 | 3.00 |
| 2005 | 3.30 | 3.00 |
| 2006 | .90 | .90 |
| 2007 | 4.20 | 4.30 |
| 2008 | .80 | .80 |
| 2009 | .10 | .20 |
| 2010 | .00 | .00 |
| 2012 | .00 | .40 |
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