Argentina	Hungary	Norway
Australia	Iceland	Philippines
Austria	Indonesia	Portugal
Belgium*	Iran	Romania
Bulgaria	Ireland	Russian Federation
Canada	Israel	Scotland
Colombia	Italy	Singapore
Cyprus	Japan	Slovak Republic
Czech Republic	Korea	Slovenia
Denmark	Kuwait	South Africa
England	Latvia	Spain
France	Lithuania	Sweden
Germany	Mexico	Switzerland
Greece	Netherlands	Thailand
Hong Kong	New Zealand	United States

*The Flemish and French educational systems in Belgium participated separately