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| year | production | consumption |
| 1980 | 1.70 | 1.50 |
| 1981 | 1.70 | 1.50 |
| 1982 | 1.80 | 1.60 |
| 1983 | 2.00 | 1.70 |
| 1984 | 1.90 | 1.70 |
| 1985 | 1.70 | 1.40 |
| 1986 | 1.70 | 1.40 |
| 1987 | 1.90 | 1.60 |
| 1988 | 1.90 | 1.50 |
| 1989 | 2.10 | 1.70 |
| 1990 | 2.40 | 2.10 |
| 1991 | 2.00 | 1.70 |
| 1992 | 2.20 | 1.70 |
| 1993 | 3.60 | 3.60 |
| 1994 | 4.50 | 4.00 |
| 1995 | 5.50 | 4.90 |
| 1996 | 5.70 | 5.00 |
| 1997 | 5.90 | 5.20 |
| 1998 | 6.10 | 5.50 |
| 1999 | 6.20 | 5.60 |
| 2000 | 6.20 | 5.60 |
| 2001 | 6.30 | 5.70 |
| 2002 | 6.50 | 5.90 |
| 2003 | 6.70 | 6.10 |
| 2004 | 6.80 | 6.10 |
| 2005 | 7.00 | 6.10 |
| 2006 | 7.00 | 6.10 |
| 2007 | 5.60 | 4.90 |
| 2008 | 4.00 | 3.00 |
| 2009 | 4.20 | 3.20 |
| 2010 | 4.10 | 3.20 |
| 2011 | 4.20 | 3.20 |
| 2012 | 3.90 | 2.90 |
| 2013 | 3.90 | 2.80 |
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