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| year | production | consumption |
| 1992 | 15.00 | 15.00 |
| 1993 | 11.00 | 11.00 |
| 1994 | 5.30 | 5.30 |
| 1995 | 5.30 | 5.40 |
| 1996 | 9.10 | 8.70 |
| 1997 | 7.80 | 8.50 |
| 1998 | 4.80 | 5.70 |
| 1999 | 3.60 | 3.60 |
| 2000 | 1.50 | 1.50 |
| 2002 | .30 | .30 |
| 2003 | .30 | .30 |
| 2004 | .40 | .40 |
| 2005 | 2.70 | 1.40 |
| 2006 | 1.10 | 1.40 |
| 2007 | 2.50 | 3.70 |
| 2008 | 1.60 | 2.00 |
| 2009 | 3.60 | 4.10 |
| 2010 | 4.70 | 3.20 |
| 2011 | 3.70 | 3.40 |
| 2012 | 3.50 | 4.20 |
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