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Loading...
| year | production | consumption |
| 1980 | 4.50 | 6.90 |
| 1981 | 4.50 | 7.00 |
| 1982 | 4.10 | 7.20 |
| 1983 | 4.40 | 7.00 |
| 1984 | 4.50 | 7.10 |
| 1985 | 5.00 | 7.10 |
| 1986 | 6.00 | 7.90 |
| 1987 | 7.70 | 8.10 |
| 1988 | 8.00 | 8.30 |
| 1989 | 8.70 | 9.20 |
| 1990 | 9.30 | 9.90 |
| 1991 | 9.00 | 9.40 |
| 1992 | 8.20 | 8.30 |
| 1993 | 7.40 | 8.80 |
| 1994 | 7.20 | 8.20 |
| 1995 | 7.40 | 8.50 |
| 1996 | 7.00 | 8.80 |
| 1997 | 7.00 | 9.60 |
| 1998 | 6.30 | 9.00 |
| 1999 | 6.80 | 9.70 |
| 2000 | 6.70 | 10.00 |
| 2001 | 7.60 | 10.00 |
| 2002 | 8.30 | 10.00 |
| 2003 | 8.50 | 10.00 |
| 2004 | 9.40 | 10.00 |
| 2005 | 9.00 | 10.00 |
| 2006 | 7.60 | 10.00 |
| 2007 | 7.30 | 9.00 |
| 2008 | 7.40 | 7.60 |
| 2009 | 7.10 | 7.20 |
| 2010 | 8.40 | 7.50 |
| 2011 | 8.90 | 8.10 |
| 2012 | 8.80 | 7.90 |
| 2013 | 9.20 | 7.60 |
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