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| year | production | consumption |
| 1986 | .00 | 4.90 |
| 1987 | .00 | 4.90 |
| 1988 | .00 | 4.70 |
| 1989 | .00 | 4.90 |
| 1990 | .00 | 5.00 |
| 1991 | .00 | 5.00 |
| 1992 | .00 | 4.90 |
| 1993 | .00 | 4.90 |
| 1994 | .00 | 4.80 |
| 2002 | .00 | 6.20 |
| 2003 | .00 | 7.90 |
| 2006 | 2.20 | 5.30 |
| 2007 | 2.10 | 5.00 |
| 2008 | 2.20 | 6.20 |
| 2009 | 1.90 | 5.90 |
| 2010 | 1.90 | 5.90 |
| 2011 | 1.90 | 5.90 |
| 2012 | 1.90 | 5.90 |
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