2010
Florence,
Italy
2013
Toronto,
Canada
2015
London,
Great Britain
2018
Perth,
Australia
2019
Heidelberg,
Germany
1. Canada United States United States United States 
2. Japan Canada Canada Italy 
3. Germany Australia Japan Australia 
4. Colombia Germany Great Britain Germany 
5. Australia Great Britain Austria Canada 
6. Great Britain Japan New Zealand Japan 
7. Switzerland Austria Germany Great Britain 
8. Sweden Italy Ireland Switzerland 
9. Finland Colombia Australia Colombia 
10. Austria New Zealand Switzerland Ireland 
11. Russia Switzerland Colombia Austria 
12. Ireland France Italy Philippines 
13. France Dominican Republic Belgium New Zealand 
14. Italy Ireland Denmark Singapore 
15. Slovakia Mexico Sweden Chinese Taipei 
16.    Mexico China 
17.    Poland  
18.    Spain  
19.    Philippines  
20.    The Netherlands