2012 22-24 August, Tokyo, Japan (34th)
2011 31 July - 3 August, Oxford, United Kingdom (33rd)
2010 7-10 July, Paris, France (32nd)
2009 23-25 September, Lüneburg, Germany (31st)
2008 1-3 December, Sydney, Australia (30th)
2007 17-19 October, Washington DC, USA (29th)
2006 16-18 August, Copenhagen, Denmark (28th)
2005 2-4 November, Halifax, Canada (27th)
2004 27-29 October, Roma, Italy (26th)
2003 17-19 September, Brussels, Belgium (25th)
2002 16-18 October, Lisbon, Portugal (24th)
2001 3-5 October, Oslo, Norway (23rd)
2000 7-9 June, Belo Horizante, Brazil (22nd)
1999 6-8 October, Colchester, United Kingdom (21st)
1998 27-30 July, Montréal, Canada (20th)
1997 8-10 October, Stockholm, Sweden (19th)
1996 2-4 September, Vienna, Austria (18th)
1995 30 May - 2 June, Jarakranka, Poland (17th)
1994 August, Bielefeld, Germany (16th)
1993 Amsterdam, Netherlands (15th)
1992 16-18 June, Rome, Italy (14th)
1990 9-13 July, Madrid, Spain (13th)
1989 11-15 September, Varna, Bulgaria (12th)
1988 14-16 June, Budapest, Hungary (11th)
1987 25-26 May, Dublin, Ireland (European)
1986 18-19 August, New Delhi, India (10th)
1984 8-10 August, Espoo/ Helsinki, Finland (9th)
1982 Mexico City, Mexico (8th)
1980 1-3 October, Sofia, Bulgaria (7th)
1978 August, Uppsalla, Sweden (6th)
1975 October, Laxenburg, Austria (5th)
1974 August, Toronto, Canada (4th)
1973 October, East Berlin, East Germany (3rd)
1972 October, Brussels, Belgium (2nd)
1970 September, Varna, Bulgaria (1st)
