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| year | production | consumption |
| 1980 | 4.40 | 3.90 |
| 1981 | 4.30 | 3.60 |
| 1982 | 4.20 | 3.60 |
| 1983 | 4.60 | 3.90 |
| 1984 | 4.80 | 4.10 |
| 1985 | 5.10 | 4.40 |
| 1986 | 5.30 | 4.60 |
| 1987 | 5.30 | 4.50 |
| 1988 | 5.30 | 4.70 |
| 1989 | 5.90 | 4.80 |
| 1990 | 5.60 | 4.40 |
| 1991 | 5.20 | 4.40 |
| 1992 | 6.00 | 4.20 |
| 1993 | 5.50 | 3.90 |
| 1994 | 5.30 | 4.00 |
| 1995 | 6.10 | 4.50 |
| 1996 | 6.00 | 4.70 |
| 1997 | 5.00 | 4.40 |
| 1998 | 4.70 | 4.10 |
| 1999 | 5.30 | 4.40 |
| 2000 | 5.90 | 4.50 |
| 2001 | 5.90 | 4.60 |
| 2002 | 6.10 | 4.40 |
| 2003 | 6.10 | 4.60 |
| 2004 | 7.00 | 4.60 |
| 2005 | 7.30 | 4.80 |
| 2006 | 7.50 | 5.70 |
| 2007 | 7.80 | 6.10 |
| 2008 | 7.50 | 6.00 |
| 2009 | 7.80 | 6.60 |
| 2010 | 7.80 | 6.70 |
| 2011 | 7.80 | 7.10 |
| 2012 | 7.90 | 7.30 |
| 2013 | 8.50 | 7.90 |
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