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| year | production | consumption |
| 1986 | 5.90 | 8.70 |
| 1987 | 5.10 | 8.00 |
| 1988 | 4.60 | 9.60 |
| 1989 | 5.10 | 8.40 |
| 1990 | 4.80 | 10.00 |
| 1991 | 4.80 | 8.90 |
| 1992 | 5.50 | 9.20 |
| 1993 | 6.50 | 9.90 |
| 1994 | 5.70 | 9.90 |
| 1995 | 4.70 | 8.60 |
| 1996 | 4.70 | 12.00 |
| 1997 | 5.00 | 11.00 |
| 1998 | 4.90 | 11.00 |
| 1999 | 9.40 | 15.00 |
| 2000 | 9.40 | 15.00 |
| 2001 | 9.90 | 17.00 |
| 2002 | 9.70 | 17.00 |
| 2003 | 9.40 | 16.00 |
| 2004 | 9.40 | 16.00 |
| 2005 | 11.00 | 17.00 |
| 2006 | 11.00 | 20.00 |
| 2007 | 4.20 | 16.00 |
| 2008 | 4.20 | 27.00 |
| 2009 | 3.90 | 27.00 |
| 2010 | 4.20 | 28.00 |
| 2011 | 4.20 | 27.00 |
| 2012 | 3.00 | 22.00 |
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