| 1965 | FoundingCong. | Paris, France |
| 1966 | 1st cong. | Prague, Czechoslovakia |
| 1968 | 2nd cong. | The Hague, Netherlands |
| 1970 | 3rd cong. | Venice, Italy |
| 1972 | 4th cong. | Montreal (Canada) & New York (USA) |
| 1975 | 5th cong. | Berline, East Germany |
| 1978 | 6th cong. | Madrid, Spain |
| 1981 | 7th cong. | Lyon, France |
| 1984 | 8th cong. | Moscow, USSR |
| 1987 | 9th cong. | Adelaide, Australia |
| 1990 | 10th cong. | Stockholm, Sweden |
| 1993 | 11th cong. | Havana, Cuba |
| 1996 | 12th cong. | Rostov, Russia |
| 1999 | 13th cong. | Tromso, Norway |
| 2002 | 14th cong. | Seoul, Korea |
| 2005 | 15th cong. | Montoreal, Canada |
| 2008 | 16th cong. | Adelaide, AUSTRALIA |
| 2011 | 17th cong. | Copenhagen-Malmoe, Denmark-Sweden |
| 2014 | 18th cong. | Warsaw, Poland |
| 2017 | 19th cong. | Cape Town, South Africa |
| 2021 | 20th cong. | Tokyo & Nagano, Japan |
| 2024 | 21th cong. | Havana, Cuba |