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| year | production | consumption |
| 1986 | 1.80 | 5.40 |
| 1987 | 2.30 | 6.90 |
| 1988 | 1.80 | 6.50 |
| 1989 | 1.70 | 8.90 |
| 1990 | 2.70 | 7.90 |
| 1991 | 2.50 | 7.40 |
| 1992 | 2.80 | 9.20 |
| 1993 | 2.30 | 8.90 |
| 1994 | 2.50 | 10.00 |
| 1995 | 1.80 | 14.00 |
| 1996 | 1.40 | 12.00 |
| 1997 | 1.10 | 13.00 |
| 1998 | 1.20 | 15.00 |
| 1999 | 1.10 | 18.00 |
| 2000 | 1.00 | 15.00 |
| 2001 | 1.10 | 14.00 |
| 2002 | .90 | 17.00 |
| 2003 | .80 | 18.00 |
| 2004 | .70 | 18.00 |
| 2005 | .50 | 17.00 |
| 2006 | .00 | 17.00 |
| 2007 | .00 | 18.00 |
| 2008 | .00 | 19.00 |
| 2009 | .00 | 19.00 |
| 2010 | .00 | 19.00 |
| 2011 | .00 | 21.00 |
| 2012 | .00 | 22.00 |
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