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| year | production | consumption |
| 1986 | 2.20 | 7.10 |
| 1987 | 2.10 | 9.70 |
| 1988 | 3.50 | 12.00 |
| 1989 | 4.60 | 10.00 |
| 1990 | 3.40 | 9.80 |
| 1991 | .90 | 6.20 |
| 1992 | 1.50 | 6.80 |
| 1993 | 1.40 | 6.80 |
| 1994 | 1.50 | 6.90 |
| 1995 | 1.60 | 5.90 |
| 1996 | 1.60 | 6.00 |
| 1997 | 1.30 | 6.90 |
| 1998 | 1.20 | 6.50 |
| 1999 | .40 | 6.90 |
| 2000 | .40 | 4.90 |
| 2001 | .40 | 2.80 |
| 2002 | .00 | 2.40 |
| 2003 | .00 | 2.50 |
| 2004 | .00 | 5.20 |
| 2005 | .00 | 5.10 |
| 2006 | .00 | 5.10 |
| 2007 | .00 | 5.10 |
| 2008 | .00 | 5.90 |
| 2009 | .00 | 4.60 |
| 2010 | .00 | 5.90 |
| 2011 | .00 | 8.60 |
| 2012 | .00 | 9.20 |
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