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| year | production | consumption |
| 1986 | 6.30 | 6.20 |
| 1987 | 7.00 | 7.00 |
| 1988 | 9.70 | 7.60 |
| 1989 | 9.40 | 9.50 |
| 1990 | 11.00 | 10.00 |
| 1991 | 9.00 | 10.00 |
| 1992 | 12.00 | 11.00 |
| 1993 | 12.00 | 12.00 |
| 1994 | 13.00 | 15.00 |
| 1995 | 14.00 | 14.00 |
| 1996 | 13.00 | 13.00 |
| 1997 | 12.00 | 13.00 |
| 1998 | 12.00 | 14.00 |
| 1999 | 13.00 | 14.00 |
| 2000 | 11.00 | 12.00 |
| 2001 | 8.60 | 11.00 |
| 2002 | 8.80 | 10.00 |
| 2003 | 7.70 | 8.30 |
| 2004 | 4.80 | 8.00 |
| 2005 | 5.80 | 6.40 |
| 2006 | 3.60 | 4.40 |
| 2007 | 3.40 | 9.70 |
| 2008 | 2.80 | 6.40 |
| 2009 | 2.70 | 2.90 |
| 2010 | 3.00 | 3.50 |
| 2011 | 2.10 | 2.70 |
| 2012 | 1.90 | 2.80 |
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