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| year | production | consumption |
| 1986 | 4.60 | 4.60 |
| 1987 | 4.70 | 4.80 |
| 1988 | 4.70 | 5.40 |
| 1989 | 4.60 | 5.40 |
| 1990 | 4.00 | 5.90 |
| 1991 | 4.10 | 6.30 |
| 1992 | 4.50 | 6.50 |
| 1993 | 4.40 | 6.60 |
| 1994 | 4.30 | 8.50 |
| 1995 | 3.50 | 8.70 |
| 1996 | 5.60 | 8.90 |
| 1997 | 6.60 | 9.00 |
| 1998 | 7.90 | 9.50 |
| 1999 | 6.70 | 11.00 |
| 2000 | 7.20 | 22.00 |
| 2001 | 6.60 | 14.00 |
| 2002 | 6.60 | 14.00 |
| 2003 | 6.50 | 16.00 |
| 2004 | 7.30 | 13.00 |
| 2005 | 7.20 | 13.00 |
| 2006 | 25.00 | 23.00 |
| 2007 | 6.30 | 26.00 |
| 2008 | 6.60 | 29.00 |
| 2009 | 5.80 | 32.00 |
| 2010 | 6.50 | 36.00 |
| 2011 | 5.90 | 40.00 |
| 2012 | 5.90 | 44.00 |
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