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| 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
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