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| year | production | consumption |
| 1986 | 5.50 | 5.50 |
| 1987 | 5.00 | 5.00 |
| 1988 | 5.00 | 5.00 |
| 1989 | 5.00 | 5.00 |
| 1990 | 5.90 | 5.90 |
| 1991 | 5.70 | 5.70 |
| 1992 | 5.20 | 5.40 |
| 1993 | 5.30 | 4.10 |
| 1994 | 5.90 | 4.90 |
| 1995 | 5.10 | 4.80 |
| 1996 | 5.10 | 4.80 |
| 1997 | 6.00 | 4.90 |
| 1998 | 6.00 | 4.80 |
| 1999 | 7.40 | 6.20 |
| 2000 | 9.40 | 7.30 |
| 2001 | 8.60 | 7.40 |
| 2002 | 7.60 | 8.60 |
| 2003 | 9.10 | 9.00 |
| 2004 | 12.00 | 8.10 |
| 2005 | 12.00 | 8.30 |
| 2006 | 12.00 | 9.10 |
| 2007 | 12.00 | 11.00 |
| 2008 | 13.00 | 13.00 |
| 2009 | 12.00 | 13.00 |
| 2010 | 15.00 | 14.00 |
| 2011 | 15.00 | 17.00 |
| 2012 | 14.00 | 18.00 |
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