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| year | production | consumption |
| 1986 | 12.00 | 15.00 |
| 1987 | 12.00 | 14.00 |
| 1988 | 12.00 | 13.00 |
| 1989 | 14.00 | 14.00 |
| 1990 | 12.00 | 13.00 |
| 1991 | 11.00 | 12.00 |
| 1992 | 11.00 | 12.00 |
| 1993 | 10.00 | 12.00 |
| 1994 | 11.00 | 13.00 |
| 1995 | 11.00 | 12.00 |
| 1996 | 11.00 | 12.00 |
| 1997 | 5.20 | 4.60 |
| 1998 | 1.60 | 3.20 |
| 1999 | 1.80 | 3.00 |
| 2000 | 4.60 | 4.70 |
| 2001 | 3.70 | 3.70 |
| 2002 | 2.40 | 2.50 |
| 2003 | 2.60 | 2.70 |
| 2004 | 4.60 | 5.40 |
| 2005 | 5.60 | 5.40 |
| 2006 | 2.70 | 2.90 |
| 2007 | 2.90 | 8.80 |
| 2008 | .90 | 1.80 |
| 2009 | .50 | 1.70 |
| 2010 | .00 | 1.70 |
| 2011 | .00 | 1.70 |
| 2012 | .00 | 1.70 |
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