• 2016 20-22 July 2016, Seoul, Korea (38th)
  • 2015 5-7 August 2015, Ankara, Turkey (37th)
  • 2014 30 July - 1 August 2014, Turku, Finland (36th)
  • 2013 7-10 August 2013, Rio de Janeiro, Brasil (35th)
  • 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)
  • 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)