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| year | production | consumption |
| 1986 | 2.00 | 2.00 |
| 1987 | 1.80 | 1.90 |
| 1988 | 1.90 | 1.90 |
| 1989 | 1.90 | 2.00 |
| 1990 | 1.90 | 1.90 |
| 1991 | 1.00 | 1.20 |
| 1992 | .90 | 1.00 |
| 1993 | .90 | 1.00 |
| 1994 | .90 | 1.00 |
| 1995 | .90 | 1.00 |
| 1996 | .90 | 1.00 |
| 1997 | .90 | 1.00 |
| 1998 | .90 | 1.00 |
| 1999 | .90 | 1.00 |
| 2000 | .00 | 1.00 |
| 2001 | .00 | 1.00 |
| 2002 | .00 | 1.00 |
| 2003 | .00 | 1.00 |
| 2004 | .00 | 1.00 |
| 2005 | .00 | .90 |
| 2006 | .10 | .80 |
| 2007 | .10 | .90 |
| 2008 | .00 | .80 |
| 2009 | .00 | .80 |
| 2010 | .00 | .80 |
| 2011 | .00 | .80 |
| 2012 | .00 | .80 |
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