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| year | production | consumption |
| 1986 | .20 | 1.80 |
| 1987 | .40 | 2.00 |
| 1988 | .30 | 1.90 |
| 1989 | .20 | 1.90 |
| 1990 | .30 | 2.10 |
| 1991 | .30 | 2.20 |
| 1992 | .40 | 2.20 |
| 1993 | .30 | 2.30 |
| 1994 | .20 | 2.40 |
| 1995 | .10 | 1.70 |
| 1996 | .70 | 2.20 |
| 1997 | .50 | 2.90 |
| 1998 | .90 | 3.10 |
| 1999 | 1.00 | 3.20 |
| 2000 | 1.00 | 3.30 |
| 2001 | 1.10 | 3.30 |
| 2002 | 1.30 | 3.20 |
| 2003 | .00 | 4.10 |
| 2004 | .00 | 6.20 |
| 2005 | .00 | 3.70 |
| 2007 | .00 | 4.10 |
| 2008 | .00 | 4.30 |
| 2009 | .00 | 4.90 |
| 2010 | .00 | 9.30 |
| 2011 | .00 | 7.60 |
| 2012 | .00 | 7.80 |
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