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| year | production | consumption |
| 1992 | 5.70 | 3.00 |
| 1993 | 4.90 | .40 |
| 1994 | 5.30 | 3.10 |
| 1995 | 6.20 | 1.40 |
| 1996 | 5.40 | 1.00 |
| 1997 | 8.50 | 2.80 |
| 1998 | 6.40 | .90 |
| 1999 | 7.30 | .80 |
| 2000 | 9.20 | 3.00 |
| 2001 | 8.50 | 1.30 |
| 2002 | 9.50 | 1.50 |
| 2003 | 9.80 | 1.70 |
| 2004 | 9.60 | 2.00 |
| 2005 | 9.70 | 2.00 |
| 2006 | 13.00 | 7.40 |
| 2007 | 7.70 | 8.30 |
| 2008 | 8.10 | 7.90 |
| 2009 | 9.60 | 4.10 |
| 2010 | 7.90 | 6.70 |
| 2011 | 6.90 | 5.80 |
| 2012 | 7.70 | 4.80 |
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