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| year | production | consumption |
| 1986 | 14.00 | 14.00 |
| 1987 | 13.00 | 13.00 |
| 1988 | 12.00 | 12.00 |
| 1989 | 11.00 | 11.00 |
| 1990 | 8.80 | 8.80 |
| 1991 | 5.50 | 5.50 |
| 1992 | 5.50 | 5.50 |
| 1993 | 4.20 | 4.20 |
| 1994 | 3.00 | 2.80 |
| 1995 | 3.00 | 3.00 |
| 1996 | .80 | 4.00 |
| 1997 | .80 | .80 |
| 1998 | .80 | 1.30 |
| 1999 | 1.40 | 1.40 |
| 2000 | 1.20 | 4.40 |
| 2001 | .80 | 1.00 |
| 2002 | 1.40 | 1.40 |
| 2003 | .90 | .90 |
| 2004 | 1.30 | 1.40 |
| 2005 | 1.30 | 1.30 |
| 2006 | 1.00 | 1.00 |
| 2007 | .60 | .60 |
| 2008 | .50 | .50 |
| 2009 | .50 | .50 |
| 2010 | .10 | .20 |
| 2011 | .20 | .30 |
| 2012 | .20 | .20 |
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