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| year | production | consumption |
| 1986 | 5.30 | 6.90 |
| 1987 | 6.50 | 8.40 |
| 1988 | 6.80 | 9.70 |
| 1989 | 6.50 | 12.00 |
| 1990 | 7.70 | 13.00 |
| 1991 | 7.90 | 13.00 |
| 1992 | 8.30 | 15.00 |
| 1993 | 7.50 | 17.00 |
| 1994 | 9.10 | 22.00 |
| 1995 | 9.60 | 21.00 |
| 1996 | 14.00 | 40.00 |
| 1997 | 15.00 | 26.00 |
| 1998 | 14.00 | 31.00 |
| 1999 | 16.00 | 34.00 |
| 2000 | 13.00 | 34.00 |
| 2001 | 13.00 | 33.00 |
| 2002 | 14.00 | 34.00 |
| 2003 | 13.00 | 30.00 |
| 2004 | 8.70 | 32.00 |
| 2005 | 11.00 | 31.00 |
| 2006 | 11.00 | 31.00 |
| 2007 | 7.90 | 32.00 |
| 2008 | 9.70 | 32.00 |
| 2009 | 9.20 | 35.00 |
| 2010 | 12.00 | 35.00 |
| 2011 | 12.00 | 36.00 |
| 2012 | 11.00 | 35.00 |
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