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| year | production | consumption |
| 1986 | 2.90 | 5.40 |
| 1987 | 3.00 | 6.10 |
| 1988 | 3.00 | 6.60 |
| 1989 | 3.20 | 6.80 |
| 1990 | 2.40 | 7.30 |
| 1991 | 3.10 | 6.60 |
| 1992 | 2.70 | 8.20 |
| 1993 | 2.80 | 9.10 |
| 1994 | 2.90 | 9.50 |
| 1995 | 2.60 | 8.60 |
| 1996 | 3.10 | 13.00 |
| 1997 | 3.20 | 13.00 |
| 1998 | 2.90 | 15.00 |
| 1999 | 3.30 | 16.00 |
| 2000 | 3.50 | 18.00 |
| 2001 | 3.40 | 19.00 |
| 2002 | 2.60 | 19.00 |
| 2003 | .00 | 18.00 |
| 2004 | .00 | 19.00 |
| 2007 | .00 | 21.00 |
| 2008 | .00 | 21.00 |
| 2009 | .00 | 23.00 |
| 2010 | .00 | 22.00 |
| 2011 | .00 | 22.00 |
| 2012 | .00 | 22.00 |
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