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Loading...
| year | production | consumption |
| 1980 | 3.30 | 2.70 |
| 1981 | 3.50 | 3.10 |
| 1982 | 3.50 | 2.90 |
| 1983 | 7.30 | 3.00 |
| 1984 | 7.20 | 3.10 |
| 1985 | 6.50 | 3.10 |
| 1986 | 7.30 | 3.30 |
| 1987 | 7.50 | 3.50 |
| 1988 | 6.80 | 3.70 |
| 1989 | 5.60 | 3.60 |
| 1990 | 7.40 | 5.10 |
| 1991 | 6.90 | 4.10 |
| 1992 | 8.80 | 4.20 |
| 1993 | 7.90 | 4.50 |
| 1994 | 7.60 | 4.70 |
| 1995 | 6.20 | 5.00 |
| 1996 | 6.60 | 5.10 |
| 1997 | 7.10 | 5.60 |
| 1998 | 10.00 | 6.30 |
| 1999 | 7.00 | 6.20 |
| 2000 | 7.50 | 6.50 |
| 2001 | 9.20 | 6.60 |
| 2002 | 9.50 | 6.10 |
| 2003 | 8.50 | 6.00 |
| 2004 | 5.80 | 6.20 |
| 2005 | 7.60 | 6.50 |
| 2006 | 5.50 | 7.30 |
| 2007 | 9.30 | 7.90 |
| 2008 | 8.50 | 8.40 |
| 2009 | 8.60 | 8.70 |
| 2010 | 11.00 | 9.30 |
| 2011 | 10.00 | 9.30 |
| 2012 | 10.00 | 9.70 |
| 2013 | 11.00 | 9.80 |
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