2010
Florence,
Italy		 2013
Toronto,
Canada		 2015
London,
Great Britain		 2018
Perth,
Australia		 2019
Heidelberg,
Germany		 2023
Nottingham,
Great Britain
1. Great Britain United States United States United States United States United States
2. Belgium Canada Australia Japan Japan Singapore
3. Germany Japan Canada Canada Singapore Japan
4. Poland Venezuela Germany Australia Latvia Canada
5. Slovakia Ireland Great Britain Singapore Canada Switzerland
6. Austria Austria South Africa Germany The Netherlands Great Britain
7. Italy Great Britain Japan Great Britain Australia New Zealand
8. Ireland Australia Chinese Taipei Colombia Poland Chinese Taipei
9.   Colombia India New Zealand Czech Republic Sweden
10.   Germany Philippines Denmark Sweden Germany
11.   Chinese Taipei Ireland Malaysia Colombia Australia
12.    Colombia India Germany Hong Kong
13.     Hong Kong Great Britain China
14.     China France South Africa
15.      Spain Finland
16.      Italy Colombia
17.      Ireland 
18.      South Africa 
19.      Hong Kong 
20.      China 
21.      Mexico