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| year | production | consumption |
| 1992 | 8.60 | 6.90 |
| 1993 | 7.60 | 7.80 |
| 1994 | .80 | 9.20 |
| 1995 | .90 | 7.00 |
| 1996 | 3.30 | 7.90 |
| 1997 | 3.30 | 6.60 |
| 1998 | 5.40 | 6.60 |
| 1999 | 4.70 | 5.40 |
| 2000 | 7.10 | 6.40 |
| 2001 | 5.40 | 4.50 |
| 2002 | 3.90 | 5.60 |
| 2003 | 4.60 | 4.40 |
| 2004 | 5.40 | 4.40 |
| 2005 | 5.70 | 4.60 |
| 2006 | 6.20 | 5.30 |
| 2007 | 6.50 | 5.90 |
| 2008 | 6.60 | 4.60 |
| 2009 | 6.90 | 5.10 |
| 2010 | 5.00 | 4.10 |
| 2011 | 4.70 | 3.50 |
| 2012 | 1.80 | 3.60 |
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