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| year | production | consumption |
| 1992 | 3.40 | 3.40 |
| 1993 | 5.30 | 4.00 |
| 1994 | .20 | 5.00 |
| 1995 | .20 | 5.00 |
| 1996 | 1.00 | 6.00 |
| 1997 | 7.20 | 7.20 |
| 1998 | .50 | 8.00 |
| 1999 | .50 | .50 |
| 2000 | .50 | 1.50 |
| 2001 | 10.00 | 10.00 |
| 2002 | 13.00 | 13.00 |
| 2003 | 8.50 | 8.30 |
| 2004 | 9.40 | 9.40 |
| 2005 | 12.00 | 11.00 |
| 2006 | 1.10 | 1.10 |
| 2007 | .20 | .90 |
| 2008 | .20 | .80 |
| 2009 | .30 | .90 |
| 2010 | .80 | .80 |
| 2011 | .80 | .80 |
| 2012 | .70 | .70 |
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