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| year | production | consumption |
| 1986 | .00 | 6.50 |
| 1987 | .00 | 6.50 |
| 1988 | .00 | 11.00 |
| 1989 | .00 | 11.00 |
| 1990 | .20 | 16.00 |
| 1991 | .20 | 14.00 |
| 1992 | .20 | 16.00 |
| 1993 | .20 | 20.00 |
| 1994 | .20 | 22.00 |
| 1995 | .20 | 24.00 |
| 1996 | .20 | 26.00 |
| 1997 | .20 | 34.00 |
| 1998 | .20 | 27.00 |
| 1999 | .00 | 32.00 |
| 2000 | .00 | 34.00 |
| 2001 | 1.00 | 37.00 |
| 2002 | .00 | 48.00 |
| 2003 | .00 | 50.00 |
| 2004 | .00 | 61.00 |
| 2005 | .00 | 61.00 |
| 2006 | .00 | 60.00 |
| 2007 | .00 | 73.00 |
| 2008 | .00 | 81.00 |
| 2009 | 16.00 | 95.00 |
| 2010 | 54.00 | 105.00 |
| 2011 | 55.00 | 112.00 |
| 2012 | 61.00 | 118.00 |
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