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| year | production | consumption |
| 1986 | 3.00 | 7.00 |
| 1987 | 2.80 | 4.60 |
| 1988 | 2.90 | 4.50 |
| 1989 | 3.00 | 4.50 |
| 1990 | 3.00 | 4.80 |
| 1991 | 2.80 | 3.40 |
| 1992 | 4.70 | 8.40 |
| 1993 | 5.10 | 8.60 |
| 1994 | 5.40 | 5.50 |
| 1995 | 8.70 | 9.50 |
| 1996 | 8.60 | 8.60 |
| 1997 | 9.70 | 9.70 |
| 1998 | 9.70 | 18.00 |
| 1999 | 10.00 | 10.00 |
| 2000 | 11.00 | 11.00 |
| 2001 | 11.00 | 11.00 |
| 2002 | 11.00 | 11.00 |
| 2003 | 11.00 | 11.00 |
| 2004 | 11.00 | 11.00 |
| 2005 | 10.00 | 18.00 |
| 2006 | 11.00 | 11.00 |
| 2007 | 9.30 | 9.30 |
| 2008 | 9.00 | 9.00 |
| 2009 | 9.50 | 10.00 |
| 2010 | 9.00 | 11.00 |
| 2011 | 11.00 | 13.00 |
| 2012 | 10.00 | 12.00 |
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