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| year | production | consumption |
| 1986 | 7.00 | 15.00 |
| 1987 | 5.50 | 16.00 |
| 1988 | 6.80 | 11.00 |
| 1989 | 7.00 | 11.00 |
| 1990 | 4.20 | 12.00 |
| 1991 | 2.20 | 17.00 |
| 1992 | 1.70 | 23.00 |
| 1993 | 1.60 | 25.00 |
| 1994 | .00 | 26.00 |
| 1995 | .00 | 30.00 |
| 1996 | .00 | 28.00 |
| 1997 | .00 | 31.00 |
| 1998 | .00 | 33.00 |
| 1999 | .00 | 31.00 |
| 2000 | .00 | 32.00 |
| 2001 | .00 | 28.00 |
| 2002 | .00 | 28.00 |
| 2003 | .00 | 29.00 |
| 2004 | .00 | 29.00 |
| 2005 | .00 | 30.00 |
| 2006 | .00 | 27.00 |
| 2007 | .00 | 22.00 |
| 2008 | .00 | 33.00 |
| 2009 | .00 | 38.00 |
| 2010 | .00 | 37.00 |
| 2011 | .00 | 37.00 |
| 2012 | .00 | 39.00 |
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