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| year | production | consumption |
| 1986 | 3.30 | 6.20 |
| 1987 | 3.50 | 4.50 |
| 1988 | 4.30 | 4.00 |
| 1989 | 3.60 | 3.70 |
| 1990 | 4.10 | 4.50 |
| 1991 | 2.30 | 3.30 |
| 1992 | 4.20 | 6.60 |
| 1993 | 4.00 | 4.00 |
| 1994 | 6.00 | 6.30 |
| 1995 | 5.80 | 6.70 |
| 1996 | 6.00 | 6.90 |
| 1997 | 4.90 | 6.90 |
| 1998 | 6.20 | 8.30 |
| 1999 | 7.90 | 9.50 |
| 2000 | 8.00 | 11.00 |
| 2001 | 8.00 | 11.00 |
| 2002 | 7.70 | 12.00 |
| 2003 | 9.50 | 11.00 |
| 2004 | 9.60 | 12.00 |
| 2005 | 7.30 | 13.00 |
| 2006 | 2.40 | 14.00 |
| 2007 | 6.90 | 12.00 |
| 2008 | 8.40 | 5.30 |
| 2009 | 6.70 | 13.00 |
| 2010 | 5.90 | 14.00 |
| 2011 | 6.70 | 15.00 |
| 2012 | 8.40 | 17.00 |
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