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| year | production | consumption |
| 1986 | 2.60 | 2.30 |
| 1987 | 3.30 | 2.00 |
| 1988 | 3.50 | 3.50 |
| 1989 | 3.00 | 3.00 |
| 1990 | 4.30 | 4.30 |
| 1991 | 2.90 | 4.90 |
| 1992 | 1.60 | 3.80 |
| 1993 | 1.30 | 4.40 |
| 1994 | 1.50 | 2.50 |
| 1995 | 1.40 | 4.40 |
| 1996 | 1.30 | 2.80 |
| 1997 | 5.10 | 6.70 |
| 1998 | 1.90 | 2.90 |
| 1999 | 2.30 | 3.30 |
| 2000 | 6.10 | 2.20 |
| 2001 | 6.60 | 9.00 |
| 2002 | 6.80 | 7.40 |
| 2003 | 7.50 | 8.60 |
| 2004 | 7.30 | 8.50 |
| 2005 | 7.10 | 7.90 |
| 2006 | 14.00 | 16.00 |
| 2007 | 6.80 | 19.00 |
| 2008 | 6.20 | 18.00 |
| 2009 | 6.20 | 8.40 |
| 2010 | 5.90 | 16.00 |
| 2011 | 5.60 | 15.00 |
| 2012 | 6.80 | 16.00 |
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