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Loading...
| year | production | consumption |
| 1986 | 4.10 | 7.30 |
| 1987 | 4.40 | 8.00 |
| 1988 | 3.50 | 7.60 |
| 1989 | 4.10 | 8.70 |
| 1990 | 3.90 | 7.20 |
| 1991 | 2.00 | 5.90 |
| 1992 | 4.20 | 8.40 |
| 1993 | 4.30 | 8.60 |
| 1994 | .00 | 4.60 |
| 1995 | .00 | 6.20 |
| 1996 | .00 | 6.30 |
| 1997 | .00 | 6.30 |
| 1998 | .00 | 6.30 |
| 1999 | .00 | 11.00 |
| 2000 | .00 | 11.00 |
| 2001 | .00 | 12.00 |
| 2002 | .00 | 13.00 |
| 2003 | .00 | 14.00 |
| 2005 | .00 | 15.00 |
| 2006 | .00 | 18.00 |
| 2007 | .00 | 23.00 |
| 2008 | .00 | 30.00 |
| 2009 | .00 | 27.00 |
| 2010 | .00 | 24.00 |
| 2011 | .00 | 25.00 |
| 2012 | .00 | 27.00 |
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