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| year | production | consumption |
| 1986 | 1.70 | 5.60 |
| 1987 | 3.20 | 6.50 |
| 1988 | 3.50 | 7.40 |
| 1989 | 3.20 | 7.70 |
| 1990 | 2.10 | 8.20 |
| 1991 | 1.70 | 8.60 |
| 1992 | 3.00 | 12.00 |
| 1993 | 3.10 | 12.00 |
| 1994 | 3.30 | 13.00 |
| 1995 | 3.00 | 14.00 |
| 1996 | 3.60 | 12.00 |
| 1997 | 3.70 | 13.00 |
| 1998 | .30 | 14.00 |
| 1999 | .00 | 13.00 |
| 2001 | 1.80 | 14.00 |
| 2002 | 2.90 | 14.00 |
| 2003 | 3.50 | 15.00 |
| 2004 | 3.30 | 16.00 |
| 2005 | 3.10 | 15.00 |
| 2006 | 4.80 | 19.00 |
| 2007 | 5.10 | 21.00 |
| 2008 | 4.90 | 21.00 |
| 2009 | 2.60 | 20.00 |
| 2010 | 2.90 | 20.00 |
| 2011 | .00 | 20.00 |
| 2012 | .00 | 19.00 |
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