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| year | production | consumption |
| 1992 | 1.80 | 4.80 |
| 1993 | 2.30 | 4.00 |
| 1994 | 2.00 | 2.80 |
| 1995 | .20 | 3.10 |
| 1996 | .00 | 7.00 |
| 1997 | .10 | 7.00 |
| 1999 | .10 | 10.00 |
| 2000 | .90 | 11.00 |
| 2001 | 5.60 | 7.70 |
| 2002 | .00 | 7.70 |
| 2003 | .00 | 7.60 |
| 2004 | .00 | 6.80 |
| 2005 | .00 | 7.30 |
| 2006 | .00 | 7.20 |
| 2007 | .00 | 7.40 |
| 2008 | .00 | 8.20 |
| 2009 | .00 | 8.20 |
| 2010 | .00 | 8.50 |
| 2011 | .00 | 9.30 |
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