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Loading...
| year | production | consumption |
| 1980 | 5.30 | 4.60 |
| 1981 | 5.40 | 4.70 |
| 1982 | 5.00 | 4.30 |
| 1983 | 2.60 | 2.30 |
| 1984 | 1.90 | 1.60 |
| 1985 | 3.10 | 2.50 |
| 1986 | 4.50 | 3.80 |
| 1987 | 4.70 | 4.10 |
| 1988 | 4.90 | 4.20 |
| 1989 | 5.20 | 4.60 |
| 1990 | 5.70 | 5.30 |
| 1991 | 6.10 | 5.70 |
| 1992 | 6.60 | 6.10 |
| 1993 | 6.20 | 5.80 |
| 1994 | 6.10 | 5.60 |
| 1995 | 6.10 | 5.60 |
| 1996 | 6.60 | 6.10 |
| 1997 | 6.80 | 6.30 |
| 1998 | 4.70 | 5.10 |
| 1999 | 5.80 | 5.70 |
| 2000 | 7.10 | 6.00 |
| 2001 | 7.70 | 6.50 |
| 2002 | 7.10 | 6.00 |
| 2003 | 5.70 | 4.50 |
| 2004 | 5.90 | 4.50 |
| 2005 | 6.70 | 5.20 |
| 2006 | 8.20 | 6.30 |
| 2007 | 6.70 | 5.30 |
| 2008 | 8.10 | 6.00 |
| 2009 | 8.80 | 6.10 |
| 2010 | 9.90 | 6.60 |
| 2011 | 11.00 | 7.70 |
| 2012 | 12.00 | 8.60 |
| 2013 | 13.00 | 9.60 |
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