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| year | production | consumption |
| 1986 | 4.70 | 4.70 |
| 1987 | 4.90 | 4.90 |
| 1988 | 5.00 | 5.00 |
| 1989 | 4.90 | 4.90 |
| 1990 | 4.50 | 4.00 |
| 1991 | 1.90 | 1.90 |
| 1992 | 2.00 | 2.80 |
| 1993 | 1.40 | 2.30 |
| 1994 | .90 | 3.50 |
| 1995 | 1.00 | 3.60 |
| 1996 | 1.70 | 3.60 |
| 1997 | 1.70 | 4.10 |
| 1998 | 1.70 | 3.20 |
| 1999 | .60 | 2.90 |
| 2000 | .60 | 2.90 |
| 2001 | .80 | 2.50 |
| 2002 | .50 | 3.20 |
| 2003 | .10 | 3.40 |
| 2004 | .80 | 4.10 |
| 2005 | .30 | 3.60 |
| 2006 | .80 | 4.90 |
| 2007 | .00 | 3.70 |
| 2008 | .00 | 2.30 |
| 2009 | .00 | 1.30 |
| 2010 | .00 | 2.80 |
| 2011 | .00 | 2.80 |
| 2012 | .00 | 2.30 |
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