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| year | production | consumption |
| 1986 | 19.00 | .30 |
| 1987 | 14.00 | 7.10 |
| 1988 | 17.00 | .30 |
| 1989 | 20.00 | .40 |
| 1990 | 23.00 | .30 |
| 1991 | 26.00 | .60 |
| 1992 | 9.90 | .70 |
| 1993 | 34.00 | 2.00 |
| 1994 | 28.00 | .90 |
| 1995 | 32.00 | .80 |
| 1996 | 32.00 | .90 |
| 1997 | 20.00 | .50 |
| 1998 | 22.00 | 1.60 |
| 1999 | 23.00 | .60 |
| 2000 | 8.40 | .60 |
| 2001 | 7.60 | .70 |
| 2002 | 7.80 | .70 |
| 2003 | 12.00 | .70 |
| 2004 | 6.70 | .80 |
| 2005 | 8.50 | .80 |
| 2006 | 6.80 | .80 |
| 2007 | 6.80 | .50 |
| 2008 | 6.80 | .50 |
| 2009 | 6.80 | .60 |
| 2010 | .90 | .50 |
| 2011 | .50 | .50 |
| 2012 | .50 | .50 |
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