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| year | production | consumption |
| 1986 | 3.30 | 4.50 |
| 1987 | 3.70 | 4.90 |
| 1988 | 4.20 | 5.10 |
| 1989 | 4.00 | 5.70 |
| 1990 | 4.70 | 7.10 |
| 1991 | 5.70 | 6.40 |
| 1992 | 5.10 | 8.80 |
| 1993 | 5.20 | 8.30 |
| 1994 | 6.60 | 8.40 |
| 1995 | 6.10 | 7.90 |
| 1996 | 5.30 | 7.10 |
| 1997 | 7.50 | 10.00 |
| 1998 | 7.80 | 11.00 |
| 1999 | 8.40 | 12.00 |
| 2000 | 8.30 | 11.00 |
| 2001 | 8.00 | 12.00 |
| 2002 | 7.40 | 11.00 |
| 2003 | 6.70 | 11.00 |
| 2004 | 1.80 | 13.00 |
| 2005 | .00 | 13.00 |
| 2006 | .00 | 13.00 |
| 2007 | .00 | 13.00 |
| 2008 | .00 | 13.00 |
| 2009 | .00 | 13.00 |
| 2010 | .00 | 13.00 |
| 2011 | .00 | 13.00 |
| 2012 | .00 | 14.00 |
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