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| year | production | consumption |
| 1993 | 1.80 | 1.20 |
| 1994 | 1.70 | 1.20 |
| 1995 | 2.10 | 1.10 |
| 1996 | 1.70 | 1.00 |
| 1997 | 1.70 | 1.10 |
| 1998 | 1.00 | 1.00 |
| 1999 | .70 | 1.00 |
| 2000 | .00 | 1.00 |
| 2001 | 6.20 | 6.40 |
| 2002 | 4.70 | 6.70 |
| 2003 | 5.10 | 6.90 |
| 2004 | 6.90 | 7.00 |
| 2005 | 5.90 | 5.50 |
| 2006 | 5.00 | 5.10 |
| 2007 | 3.60 | 4.90 |
| 2008 | 3.20 | 5.30 |
| 2009 | 2.60 | 5.40 |
| 2010 | 2.60 | 3.90 |
| 2011 | 3.20 | 4.10 |
| 2012 | 2.80 | 4.30 |
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