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Loading...
| year | production | consumption |
| 1980 | 9.50 | 8.40 |
| 1981 | 9.40 | 8.30 |
| 1982 | 9.70 | 8.50 |
| 1983 | 9.60 | 8.40 |
| 1984 | 9.80 | 8.70 |
| 1985 | 11.00 | 9.50 |
| 1986 | 11.00 | 9.80 |
| 1987 | 12.00 | 11.00 |
| 1988 | 12.00 | 11.00 |
| 1989 | 13.00 | 11.00 |
| 1990 | 13.00 | 12.00 |
| 1991 | 14.00 | 13.00 |
| 1992 | 15.00 | 13.00 |
| 1993 | 15.00 | 14.00 |
| 1994 | 16.00 | 14.00 |
| 1995 | 16.00 | 15.00 |
| 1996 | 18.00 | 16.00 |
| 1997 | 18.00 | 17.00 |
| 1998 | 20.00 | 18.00 |
| 1999 | 20.00 | 19.00 |
| 2000 | 22.00 | 20.00 |
| 2001 | 23.00 | 21.00 |
| 2002 | 23.00 | 22.00 |
| 2003 | 23.00 | 22.00 |
| 2004 | 24.00 | 23.00 |
| 2005 | 24.00 | 24.00 |
| 2006 | 25.00 | 25.00 |
| 2007 | 26.00 | 25.00 |
| 2008 | 28.00 | 26.00 |
| 2009 | 26.00 | 25.00 |
| 2010 | 27.00 | 25.00 |
| 2011 | 26.00 | 25.00 |
| 2012 | 26.00 | 24.00 |
| 2013 | 24.00 | 24.00 |
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