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| year | production | consumption |
| 1992 | 6.00 | 5.00 |
| 1993 | 5.70 | 5.60 |
| 1994 | 1.10 | 1.10 |
| 1995 | .80 | 4.90 |
| 1996 | 2.60 | 6.30 |
| 1997 | 3.50 | 7.50 |
| 1998 | 5.60 | 6.20 |
| 1999 | 4.10 | 6.60 |
| 2000 | 5.30 | 6.30 |
| 2001 | 4.60 | 5.30 |
| 2002 | 3.50 | 5.80 |
| 2003 | 6.20 | 6.80 |
| 2004 | 7.30 | 6.90 |
| 2005 | 8.10 | 7.10 |
| 2006 | 8.60 | 7.20 |
| 2007 | 8.70 | 7.40 |
| 2008 | 9.20 | 7.10 |
| 2009 | 7.70 | 7.70 |
| 2010 | 7.40 | 8.10 |
| 2011 | 5.70 | 8.50 |
| 2012 | 1.50 | 8.50 |
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