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| year | production | consumption |
| 1992 | .00 | 7.90 |
| 1993 | .00 | 5.70 |
| 1994 | .00 | 1.80 |
| 1995 | .00 | 2.70 |
| 1996 | .00 | 2.70 |
| 1999 | 1.10 | 2.80 |
| 2000 | .70 | 7.30 |
| 2001 | .90 | 7.80 |
| 2002 | .60 | 1.70 |
| 2003 | .50 | 2.00 |
| 2004 | .60 | 2.80 |
| 2005 | .60 | 2.50 |
| 2006 | .60 | 2.60 |
| 2007 | 1.10 | 3.30 |
| 2008 | 1.20 | 3.60 |
| 2009 | .20 | 11.00 |
| 2010 | .80 | 6.50 |
| 2011 | .60 | 9.10 |
| 2012 | .60 | 11.00 |
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