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| year | production | consumption |
| 1980 | 16.00 | 24.00 |
| 1981 | 12.00 | 19.00 |
| 1982 | 13.00 | 16.00 |
| 1983 | 15.00 | 16.00 |
| 1984 | 13.00 | 13.00 |
| 1985 | 13.00 | 12.00 |
| 1986 | 13.00 | 15.00 |
| 1987 | 11.00 | 12.00 |
| 1988 | 12.00 | 12.00 |
| 1989 | 8.20 | 11.00 |
| 1990 | 8.90 | 9.30 |
| 1991 | 17.00 | 9.60 |
| 1992 | 15.00 | 11.00 |
| 1993 | 16.00 | 7.30 |
| 1994 | 15.00 | 8.10 |
| 1995 | 14.00 | 7.90 |
| 1996 | 16.00 | 7.40 |
| 1997 | 13.00 | 6.00 |
| 1998 | 13.00 | 7.50 |
| 1999 | 14.00 | 5.00 |
| 2000 | 13.00 | 3.60 |
| 2001 | 14.00 | 4.20 |
| 2002 | 13.00 | 3.00 |
| 2003 | 13.00 | 3.20 |
| 2004 | 12.00 | 3.20 |
| 2005 | 11.00 | 2.50 |
| 2006 | 10.00 | 2.80 |
| 2007 | 10.00 | 2.20 |
| 2008 | 11.00 | 2.00 |
| 2009 | 6.80 | 1.50 |
| 2010 | 6.60 | 1.40 |
| 2011 | 6.10 | 1.00 |
| 2012 | 4.90 | 1.20 |
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