| Edition | Place | Country | Year |
| 1 | New York City | USA | 1966 |
| 2 | Paramus, NJ | USA | 1968 |
| 3 | Thorn | Holland | 1988 |
| 4 | Trenton, NJ | USA | 1990 |
| 5 | Thorn | Holland | 1992 |
| 6 | Goteborg | Sweden | 1994 |
| 7 | Bowie, MD | USA | 1996 |
| 8 | Parigi | France | 1998 |
| 9 | Rio de Janeiro | Brasil | 2000 |
| 10 | Praga | Czech Republic | 2002 |
| 11 | Trenton, NJ | USA | 2004 |
| 12 | Wuerzburg | Germany | 2006 |
| 13 | Firenze | Italy | 2008 |
| 14 | Dallas, TX | USA | 2010 |
| 15 | Cambridge | UK | 2012 |
| 16 | Lannion | France | 2014 |
