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| year | production | consumption |
| 1986 | 12.00 | 3.70 |
| 1987 | 12.00 | 3.80 |
| 1988 | 15.00 | 4.40 |
| 1989 | 15.00 | 3.90 |
| 1990 | 23.00 | 11.00 |
| 1991 | 17.00 | 17.00 |
| 1992 | 17.00 | 4.10 |
| 1993 | 19.00 | 13.00 |
| 1994 | 19.00 | 2.10 |
| 1995 | 20.00 | 6.10 |
| 1996 | 21.00 | 7.60 |
| 1997 | 32.00 | 7.90 |
| 1998 | 32.00 | 8.20 |
| 1999 | 32.00 | 8.10 |
| 2000 | 29.00 | 7.80 |
| 2001 | 28.00 | 7.90 |
| 2002 | 27.00 | 7.90 |
| 2003 | 29.00 | 7.80 |
| 2004 | 29.00 | 7.90 |
| 2005 | 28.00 | 8.50 |
| 2006 | 22.00 | 12.00 |
| 2007 | 21.00 | 12.00 |
| 2008 | 19.00 | 13.00 |
| 2009 | 21.00 | 4.50 |
| 2010 | 6.80 | 3.90 |
| 2011 | 8.70 | 3.50 |
| 2012 | 12.00 | 3.40 |
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