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| year | production | consumption |
| 1992 | 26.00 | 26.00 |
| 1993 | 36.00 | 36.00 |
| 1994 | 30.00 | 30.00 |
| 1995 | 17.00 | 17.00 |
| 1996 | .20 | .20 |
| 1997 | .20 | .20 |
| 1998 | .20 | .20 |
| 1999 | .20 | .10 |
| 2000 | .10 | .10 |
| 2001 | .10 | .10 |
| 2004 | .00 | .00 |
| 2005 | .50 | .50 |
| 2006 | .40 | .40 |
| 2007 | 5.40 | 5.40 |
| 2008 | .00 | .00 |
| 2010 | .70 | .70 |
| 2011 | .50 | .50 |
| 2012 | .00 | .00 |
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