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| year | production | consumption |
| 1986 | 1.20 | 4.10 |
| 1987 | 1.00 | 3.00 |
| 1988 | 1.10 | 3.80 |
| 1989 | 1.70 | 4.40 |
| 1990 | 1.40 | 4.10 |
| 1991 | .90 | 4.90 |
| 1992 | 1.00 | 5.00 |
| 1993 | 1.10 | 5.10 |
| 1994 | 1.10 | 5.30 |
| 1995 | 1.30 | 4.50 |
| 1996 | 1.30 | 4.60 |
| 1997 | 1.30 | 5.50 |
| 1998 | 1.20 | 5.20 |
| 1999 | .20 | 3.60 |
| 2000 | .20 | 3.70 |
| 2001 | .20 | 2.60 |
| 2002 | .00 | 2.40 |
| 2003 | .00 | 2.40 |
| 2004 | .00 | 2.40 |
| 2005 | .00 | 2.60 |
| 2006 | .00 | 2.40 |
| 2007 | .00 | 3.80 |
| 2008 | .00 | 4.50 |
| 2009 | .00 | 4.60 |
| 2010 | .00 | 5.30 |
| 2011 | .00 | 5.90 |
| 2012 | .00 | 6.00 |
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