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| year | production | consumption |
| 1986 | 6.60 | 13.00 |
| 1987 | 7.40 | 13.00 |
| 1988 | 8.40 | 16.00 |
| 1989 | 8.60 | 17.00 |
| 1990 | 7.60 | 18.00 |
| 1991 | 7.30 | 20.00 |
| 1992 | 7.60 | 20.00 |
| 1993 | 9.30 | 24.00 |
| 1994 | 8.50 | 26.00 |
| 1995 | 7.60 | 29.00 |
| 1996 | 7.50 | 29.00 |
| 1997 | 7.80 | 31.00 |
| 1998 | 8.20 | 33.00 |
| 1999 | 8.70 | 34.00 |
| 2000 | 7.80 | 36.00 |
| 2001 | 7.60 | 38.00 |
| 2002 | 8.30 | 41.00 |
| 2003 | 2.30 | 41.00 |
| 2004 | 3.50 | 40.00 |
| 2005 | 6.70 | 44.00 |
| 2006 | 6.30 | 45.00 |
| 2007 | 5.40 | 46.00 |
| 2008 | 5.40 | 60.00 |
| 2009 | 3.40 | 60.00 |
| 2010 | 1.10 | 63.00 |
| 2011 | 1.50 | 65.00 |
| 2012 | 3.90 | 69.00 |
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