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| year | production | consumption |
| 1992 | .00 | 10.00 |
| 1993 | .00 | 4.70 |
| 1994 | .00 | 1.90 |
| 1995 | .00 | 1.70 |
| 1996 | .00 | 3.00 |
| 1999 | .90 | 1.60 |
| 2000 | .70 | 5.10 |
| 2001 | .80 | 4.60 |
| 2002 | .80 | 1.10 |
| 2003 | .70 | 1.40 |
| 2004 | .80 | 1.10 |
| 2005 | .90 | 1.40 |
| 2006 | .70 | 1.00 |
| 2007 | 1.00 | 1.30 |
| 2008 | 1.10 | 1.20 |
| 2009 | .20 | 4.60 |
| 2010 | .80 | 2.40 |
| 2011 | .90 | 2.50 |
| 2012 | .70 | 1.50 |
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