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| year | production | consumption |
| 1986 | .00 | 8.90 |
| 1987 | .00 | 9.90 |
| 1990 | .20 | 13.00 |
| 1991 | .20 | 11.00 |
| 1992 | .20 | 11.00 |
| 1993 | .20 | 14.00 |
| 1994 | .20 | 16.00 |
| 1995 | .20 | 18.00 |
| 1996 | .20 | 20.00 |
| 1997 | .20 | 19.00 |
| 1998 | .20 | 26.00 |
| 1999 | .00 | 26.00 |
| 2000 | .00 | 29.00 |
| 2002 | .00 | 44.00 |
| 2003 | .00 | 41.00 |
| 2004 | .00 | 39.00 |
| 2005 | .00 | 40.00 |
| 2006 | .00 | 37.00 |
| 2007 | .00 | 36.00 |
| 2008 | .00 | 31.00 |
| 2009 | 1.10 | 28.00 |
| 2010 | 4.40 | 39.00 |
| 2011 | 4.50 | 42.00 |
| 2012 | 4.90 | 44.00 |
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