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| year | production | consumption |
| 1986 | 4.30 | 4.30 |
| 1987 | 5.60 | 5.60 |
| 1988 | 5.00 | 5.00 |
| 1989 | 4.70 | 6.30 |
| 1990 | 3.60 | 5.20 |
| 1991 | 4.30 | 5.90 |
| 1992 | 4.30 | 5.90 |
| 1993 | 5.00 | 6.60 |
| 1994 | 4.40 | 6.00 |
| 1995 | 4.40 | 6.20 |
| 1996 | 7.30 | 7.10 |
| 1997 | 6.40 | 8.20 |
| 1998 | 5.60 | 7.40 |
| 1999 | 5.80 | 13.00 |
| 2000 | 7.30 | 15.00 |
| 2001 | 7.20 | 14.00 |
| 2002 | 9.10 | 15.00 |
| 2003 | 10.00 | 15.00 |
| 2004 | 13.00 | 18.00 |
| 2005 | 11.00 | 19.00 |
| 2006 | 6.00 | 21.00 |
| 2007 | 8.10 | 24.00 |
| 2008 | 7.40 | 17.00 |
| 2009 | 2.30 | 15.00 |
| 2010 | 6.00 | 20.00 |
| 2011 | 6.30 | 32.00 |
| 2012 | 2.50 | 37.00 |
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