2001
Akita,
Japan
2005
Duisburg,
Germany
2009
Kaohsiung City,
Chinese Taipei
2013
Cali,
Colombia
2017
Wroclaw,
Poland
1. Canada United States United States United States United States
2. United States Australia Japan Australia Colombia
3. Japan Canada Australia Canada Canada
4. Sweden Japan Canada Colombia Australia
5. Finland Germany Great Britain Japan Japan
6. Germany Finland Chinese Taipei Great Britain Poland