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Loading...
| year | production | consumption |
| 1980 | 9.00 | 5.00 |
| 1981 | 8.00 | .00 |
| 1982 | 6.00 | 4.00 |
| 1983 | 10.00 | 4.00 |
| 1984 | 12.00 | 3.00 |
| 1985 | 11.00 | 3.50 |
| 1986 | 13.00 | 3.30 |
| 1987 | 11.00 | 3.60 |
| 1988 | 13.00 | 2.70 |
| 1989 | 11.00 | 2.20 |
| 1990 | 9.40 | 1.90 |
| 1991 | 7.20 | 2.30 |
| 1992 | 5.00 | 1.80 |
| 1993 | 5.60 | 2.10 |
| 1994 | 4.20 | 1.90 |
| 1995 | 4.60 | 1.80 |
| 1996 | 4.50 | 2.20 |
| 1997 | 5.10 | 2.50 |
| 1998 | 4.10 | 2.70 |
| 1999 | 4.20 | 1.90 |
| 2000 | 8.10 | 1.80 |
| 2001 | 8.90 | 1.70 |
| 2002 | 10.00 | 1.50 |
| 2003 | 11.00 | 1.60 |
| 2004 | 8.10 | 1.40 |
| 2005 | 10.00 | 1.40 |
| 2006 | 7.90 | 1.20 |
| 2007 | 9.30 | 1.90 |
| 2008 | 7.30 | 1.90 |
| 2009 | 8.10 | 2.30 |
| 2010 | 6.20 | 2.20 |
| 2011 | 8.40 | 1.60 |
| 2012 | 13.00 | 3.70 |
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