History
History
| 1st | 1964 | London (UK) |
| 2nd | 1966 | Jena (Germany) |
| 3rd | 1967 | Cambridge (USA) |
| 4th | 1970 | Prague (Czech Republic) |
| 5th | 1972 | Mt. Fuji Area (Japan) |
| 6th | 1973 | Minsk (Belarus) |
| 7th | 1975 | Regensburg (Germany) |
| 8th | 1976 | York (UK) |
| 9th | 1979 | Poznan (Poland) |
| 10th | 1982 | Yokohama (Japan) |
| 11th | 1985 | Asilomar (USA) |
| 12th | 1988 | Le Creusot (France) |
| 13th | 1991 | Glasgow (UK) |
| 14th | 1994 | Dusseldorf (Germany) |
| 15th | 1997 | Sunshine Coast (Australia) |
| 16th | 2000 | Natal (Brazil) |
| 17th | 2002 | Kyoto (Japan) |
| 18th | 2003 | Madrid (Spain) |
| 19th | 2006 | Sendai (Japan) |
| 20th | 2009 | Berlin (Germany) |
| 21st | 2012 | Shanghai (China) |
| 22nd | 2015 | Cracow (Poland) |
| 23rd | 2018 | Santa Cruz (USA) |