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| year | production | consumption |
| 1992 | 34.00 | 34.00 |
| 1993 | 20.00 | 19.00 |
| 1994 | 7.00 | 7.00 |
| 1995 | 3.20 | 3.20 |
| 1996 | .50 | .30 |
| 1997 | 1.80 | .50 |
| 1998 | 1.80 | .80 |
| 2000 | 3.30 | .30 |
| 2001 | 3.00 | .20 |
| 2002 | 3.00 | .10 |
| 2003 | 2.80 | .30 |
| 2005 | 4.10 | .80 |
| 2006 | 9.80 | .10 |
| 2007 | 9.10 | .10 |
| 2008 | 7.50 | .10 |
| 2009 | 7.60 | .20 |
| 2010 | 5.30 | .00 |
| 2011 | 5.80 | .60 |
| 2012 | 3.10 | .20 |
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