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| year | production | consumption |
| 1986 | 3.90 | 3.90 |
| 1987 | 4.50 | 3.90 |
| 1988 | 4.50 | 3.60 |
| 1989 | 3.60 | 3.10 |
| 1990 | 4.50 | 3.70 |
| 1991 | 5.40 | 4.50 |
| 1992 | 4.90 | 4.80 |
| 1993 | 5.50 | 5.40 |
| 1994 | 6.00 | 5.70 |
| 1995 | 4.60 | 6.50 |
| 1996 | 5.80 | 6.60 |
| 1997 | 7.10 | 10.00 |
| 1998 | 9.30 | 9.80 |
| 1999 | 10.00 | 8.90 |
| 2000 | 10.00 | 9.10 |
| 2001 | 11.00 | 9.90 |
| 2002 | 9.80 | 11.00 |
| 2003 | 9.30 | 11.00 |
| 2004 | 10.00 | 9.90 |
| 2005 | 10.00 | 10.00 |
| 2006 | 8.70 | 10.00 |
| 2007 | 8.70 | 11.00 |
| 2008 | 7.50 | 9.40 |
| 2009 | 7.50 | 9.40 |
| 2010 | 8.70 | 9.60 |
| 2011 | 7.10 | 12.00 |
| 2012 | 5.60 | 12.00 |
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