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| year | production | consumption |
| 1986 | 4.70 | 6.60 |
| 1987 | 8.50 | 8.70 |
| 1988 | 7.30 | 7.30 |
| 1989 | 7.30 | 6.70 |
| 1990 | 9.10 | 10.00 |
| 1991 | 5.70 | 11.00 |
| 1992 | 9.70 | 11.00 |
| 1993 | 7.60 | 10.00 |
| 1994 | 6.90 | 15.00 |
| 1995 | 4.30 | 15.00 |
| 1996 | 11.00 | 11.00 |
| 1997 | 12.00 | 11.00 |
| 1998 | 13.00 | 17.00 |
| 1999 | 12.00 | 13.00 |
| 2000 | 10.00 | 12.00 |
| 2001 | 11.00 | 11.00 |
| 2002 | 5.90 | 15.00 |
| 2003 | .00 | 16.00 |
| 2004 | .00 | 18.00 |
| 2005 | .00 | 19.00 |
| 2007 | .00 | 19.00 |
| 2008 | .00 | 18.00 |
| 2009 | .00 | 18.00 |
| 2010 | .00 | 18.00 |
| 2011 | .00 | 23.00 |
| 2012 | .00 | 25.00 |
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