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| year | production | consumption |
| 1986 | .50 | 1.60 |
| 1987 | 1.50 | 3.40 |
| 1988 | 1.80 | 3.40 |
| 1989 | .90 | 3.10 |
| 1990 | 1.40 | 3.00 |
| 1991 | 1.60 | 2.80 |
| 1992 | .90 | 3.20 |
| 1993 | 1.00 | 3.30 |
| 1994 | 1.00 | 3.30 |
| 1995 | 1.00 | 3.30 |
| 1996 | 1.00 | 3.30 |
| 1997 | 1.00 | 3.40 |
| 1998 | 1.00 | 3.40 |
| 1999 | 1.00 | 3.40 |
| 2000 | 1.10 | 4.90 |
| 2001 | 1.10 | 5.70 |
| 2002 | 1.10 | 6.10 |
| 2003 | 1.20 | 6.20 |
| 2004 | 1.20 | 8.50 |
| 2005 | 1.30 | 6.60 |
| 2006 | .00 | 9.10 |
| 2007 | .00 | 8.70 |
| 2008 | .00 | 7.50 |
| 2009 | .00 | 6.80 |
| 2010 | .00 | 6.80 |
| 2011 | .00 | 6.80 |
| 2012 | .00 | 6.80 |
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