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| year | production | consumption |
| 1986 | 1.40 | 2.90 |
| 1987 | 1.30 | 2.70 |
| 1988 | 1.30 | 2.60 |
| 1989 | 1.70 | 3.20 |
| 1990 | 1.60 | 3.10 |
| 1991 | 1.50 | 3.20 |
| 1992 | 1.60 | 3.60 |
| 1993 | .00 | 4.40 |
| 1994 | .00 | 5.10 |
| 1995 | .00 | 4.70 |
| 1996 | .00 | 5.90 |
| 1997 | .00 | 5.90 |
| 1998 | .00 | 6.70 |
| 1999 | .00 | 7.10 |
| 2000 | .00 | 7.10 |
| 2001 | .00 | 7.60 |
| 2002 | .00 | 7.60 |
| 2003 | .00 | 7.50 |
| 2004 | .00 | 7.00 |
| 2005 | .00 | 7.10 |
| 2006 | .00 | 7.90 |
| 2007 | .00 | 9.50 |
| 2008 | .00 | 9.40 |
| 2009 | .00 | 11.00 |
| 2010 | .00 | 11.00 |
| 2011 | .00 | 12.00 |
| 2012 | .00 | 12.00 |
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