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| year | production | consumption |
| 1992 | 22.00 | 19.00 |
| 1993 | 32.00 | 28.00 |
| 1994 | 5.40 | 4.90 |
| 1995 | 2.60 | 5.30 |
| 1996 | 2.50 | 2.50 |
| 1997 | 2.80 | 2.80 |
| 1998 | 1.10 | 1.10 |
| 1999 | 1.30 | 1.30 |
| 2000 | 1.70 | 1.70 |
| 2001 | 1.30 | 1.30 |
| 2002 | 1.40 | 1.40 |
| 2003 | 1.40 | 1.40 |
| 2004 | 1.40 | 1.40 |
| 2005 | 1.40 | 1.40 |
| 2006 | 1.60 | 1.60 |
| 2007 | 6.60 | 6.60 |
| 2008 | 1.60 | 1.60 |
| 2009 | 1.60 | 1.60 |
| 2010 | .00 | .00 |
| 2011 | .00 | .00 |
| 2012 | .00 | .00 |
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