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| year | production | consumption |
| 1986 | 8.40 | 12.00 |
| 1987 | 9.00 | 13.00 |
| 1988 | 6.80 | 14.00 |
| 1989 | 5.90 | 14.00 |
| 1990 | 5.60 | 15.00 |
| 1991 | 7.60 | 14.00 |
| 1992 | 9.10 | 17.00 |
| 1993 | 8.50 | 17.00 |
| 1994 | 8.60 | 17.00 |
| 1995 | 8.60 | 19.00 |
| 1996 | 8.90 | 19.00 |
| 1997 | 9.20 | 20.00 |
| 1998 | 9.50 | 21.00 |
| 1999 | 7.20 | 30.00 |
| 2000 | 7.60 | 41.00 |
| 2001 | 6.70 | 40.00 |
| 2002 | 8.10 | 38.00 |
| 2003 | 8.40 | 32.00 |
| 2004 | 8.50 | 30.00 |
| 2005 | 8.70 | 30.00 |
| 2006 | 8.70 | 31.00 |
| 2007 | 7.30 | 28.00 |
| 2008 | 7.40 | 27.00 |
| 2009 | 7.00 | 28.00 |
| 2010 | 7.80 | 26.00 |
| 2011 | 7.00 | 27.00 |
| 2012 | 6.80 | 27.00 |
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