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| year | production | consumption |
| 1986 | 35.00 | .20 |
| 1987 | 37.00 | .20 |
| 1988 | 30.00 | .20 |
| 1989 | 32.00 | .30 |
| 1990 | 28.00 | .20 |
| 1991 | 55.00 | .70 |
| 1992 | 47.00 | .80 |
| 1993 | 59.00 | .80 |
| 1994 | 19.00 | .90 |
| 1995 | 63.00 | .90 |
| 1996 | 64.00 | 25.00 |
| 1997 | 5.90 | 6.80 |
| 1998 | 7.00 | .90 |
| 1999 | 18.00 | .90 |
| 2000 | 17.00 | .90 |
| 2001 | 10.00 | 1.70 |
| 2002 | 9.80 | 1.20 |
| 2003 | 9.00 | 1.20 |
| 2004 | 11.00 | 1.20 |
| 2005 | 13.00 | 1.40 |
| 2006 | 13.00 | 1.40 |
| 2007 | 12.00 | 1.60 |
| 2008 | 12.00 | 1.70 |
| 2009 | 13.00 | 1.80 |
| 2010 | 14.00 | .00 |
| 2011 | 15.00 | .00 |
| 2012 | 15.00 | .00 |
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