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| year | production | consumption |
| 1992 | 6.50 | 6.50 |
| 1993 | .10 | 6.40 |
| 1994 | 24.00 | 10.00 |
| 1995 | 14.00 | 14.00 |
| 1996 | 8.00 | 9.40 |
| 1997 | .10 | 1.80 |
| 1998 | 1.10 | 3.00 |
| 1999 | .20 | 2.70 |
| 2000 | .20 | 2.70 |
| 2001 | 1.40 | 4.00 |
| 2002 | 1.80 | 4.30 |
| 2003 | .20 | 2.70 |
| 2004 | .20 | 2.70 |
| 2005 | .20 | 2.70 |
| 2006 | .20 | 2.80 |
| 2007 | .00 | 2.50 |
| 2008 | .00 | 2.50 |
| 2009 | .20 | 2.70 |
| 2010 | 11.00 | 20.00 |
| 2011 | 10.00 | 24.00 |
| 2012 | 9.10 | 29.00 |
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