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