| 1st | New York City | USA | 1966 | |
| 2nd | Paramus, NJ | USA | 1968 | |
| 3rd | Thorn | Netherlands | 1988 | |
| 4th | Trenton, NJ | USA | 1990 | |
| 5th | Thorn | Netherlands | 1992 | |
| 6th | Gotenburg | Sweden | 1994 | |
| 7th | Bowie, MD | USA | 1996 | |
| 8th | Paris | France | 1998 | |
| 9th | Rio de Janeiro | Brasil | 2000 | |
| 10th | Prague | Czech | 2002 | |
| 11th | Trenton, NJ | USA | 2004 | |
| 12th | Wuerzburg | Germany | 2006 |