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| year | production | consumption |
| 1986 | 3.40 | 14.00 |
| 1987 | 4.10 | 14.00 |
| 1988 | 3.40 | 15.00 |
| 1989 | 4.10 | 19.00 |
| 1990 | 4.00 | 17.00 |
| 1991 | 3.80 | 15.00 |
| 1992 | 3.10 | 15.00 |
| 1993 | 5.20 | 19.00 |
| 1994 | 5.20 | 19.00 |
| 1995 | 6.10 | 24.00 |
| 1996 | 5.00 | 26.00 |
| 1997 | 5.60 | 26.00 |
| 1998 | 4.30 | 27.00 |
| 1999 | 4.30 | 30.00 |
| 2000 | 5.70 | 27.00 |
| 2001 | 5.60 | 37.00 |
| 2002 | 5.30 | 38.00 |
| 2003 | 7.20 | 38.00 |
| 2004 | 5.60 | 37.00 |
| 2005 | 6.10 | 39.00 |
| 2006 | 5.80 | 42.00 |
| 2007 | 5.30 | 47.00 |
| 2008 | 4.80 | 53.00 |
| 2009 | 4.30 | 60.00 |
| 2010 | 7.60 | 52.00 |
| 2011 | 7.70 | 66.00 |
| 2012 | 7.60 | 66.00 |
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