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| year | production | consumption |
| 1992 | .00 | 5.30 |
| 1993 | .00 | 5.40 |
| 1994 | .00 | 6.60 |
| 1995 | .00 | 5.70 |
| 1996 | .00 | 6.50 |
| 1997 | .00 | 7.10 |
| 1998 | .00 | 6.80 |
| 1999 | .00 | 6.50 |
| 2000 | .00 | 6.50 |
| 2001 | .00 | 7.80 |
| 2002 | .00 | 7.20 |
| 2003 | .00 | 7.10 |
| 2004 | .00 | 6.60 |
| 2005 | .00 | 6.70 |
| 2006 | .00 | 7.10 |
| 2007 | .00 | 7.50 |
| 2008 | .00 | 7.40 |
| 2009 | .00 | 6.80 |
| 2010 | .00 | 6.40 |
| 2011 | .00 | 6.00 |
| 2012 | .00 | 5.80 |
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