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| year | production | consumption |
| 1992 | 4.20 | 14.00 |
| 1993 | 3.90 | 18.00 |
| 1994 | 2.50 | 19.00 |
| 1995 | 3.90 | 22.00 |
| 1996 | 3.80 | 26.00 |
| 1997 | 4.10 | 27.00 |
| 1998 | 1.90 | 26.00 |
| 1999 | 2.00 | 26.00 |
| 2000 | 1.10 | 23.00 |
| 2001 | .00 | 26.00 |
| 2002 | .00 | 26.00 |
| 2003 | .00 | 27.00 |
| 2004 | .00 | 29.00 |
| 2005 | .00 | 30.00 |
| 2006 | .00 | 32.00 |
| 2007 | .00 | 32.00 |
| 2008 | .00 | 40.00 |
| 2009 | .00 | 33.00 |
| 2010 | .00 | 35.00 |
| 2011 | .00 | 36.00 |
| 2012 | .00 | 35.00 |
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