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| year | production | consumption |
| 1986 | .90 | 3.00 |
| 1987 | 1.40 | 3.20 |
| 1988 | .90 | 2.80 |
| 1989 | 1.60 | 4.60 |
| 1990 | 1.90 | 4.00 |
| 1991 | 2.50 | 4.10 |
| 1992 | 2.50 | 5.90 |
| 1993 | 2.10 | 5.10 |
| 1994 | 2.00 | 2.00 |
| 1995 | 3.30 | 3.30 |
| 1996 | 3.30 | 3.80 |
| 1997 | .80 | 12.00 |
| 1998 | .80 | 14.00 |
| 1999 | .70 | .70 |
| 2000 | .80 | 14.00 |
| 2001 | .80 | 15.00 |
| 2002 | .80 | 18.00 |
| 2003 | 2.90 | 20.00 |
| 2004 | 2.90 | 21.00 |
| 2005 | 3.10 | 21.00 |
| 2006 | 23.00 | 23.00 |
| 2007 | 2.30 | .00 |
| 2008 | 2.10 | 22.00 |
| 2009 | 2.30 | 1.60 |
| 2010 | 2.20 | 23.00 |
| 2011 | 1.70 | 18.00 |
| 2012 | 1.90 | 21.00 |
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