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| year | production | consumption |
| 1980 | 4.90 | 4.40 |
| 1981 | 5.40 | 4.80 |
| 1982 | 5.80 | 5.10 |
| 1983 | 6.30 | 5.60 |
| 1984 | 6.50 | 5.80 |
| 1985 | 6.60 | 5.90 |
| 1986 | 7.30 | 6.60 |
| 1987 | 7.70 | 7.00 |
| 1988 | 8.50 | 7.70 |
| 1989 | 8.60 | 7.70 |
| 1990 | 9.10 | 8.40 |
| 1991 | 8.70 | 8.90 |
| 1992 | 9.20 | 9.80 |
| 1993 | 9.30 | 10.00 |
| 1994 | 10.00 | 10.00 |
| 1995 | 12.00 | 11.00 |
| 1996 | 12.00 | 12.00 |
| 1997 | 13.00 | 12.00 |
| 1998 | 13.00 | 13.00 |
| 1999 | 13.00 | 13.00 |
| 2000 | 12.00 | 13.00 |
| 2001 | 14.00 | 14.00 |
| 2002 | 15.00 | 15.00 |
| 2003 | 16.00 | 16.00 |
| 2004 | 17.00 | 17.00 |
| 2005 | 19.00 | 18.00 |
| 2006 | 19.00 | 20.00 |
| 2007 | 19.00 | 21.00 |
| 2008 | 20.00 | 22.00 |
| 2009 | 20.00 | 22.00 |
| 2010 | 22.00 | 24.00 |
| 2011 | 24.00 | 25.00 |
| 2012 | 26.00 | 27.00 |
| 2013 | 26.00 | 27.00 |
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