| 2003 |
 Borovets, Bulgaria |
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| 2004 |
 Moscow, Russia |
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| 2005 |
 Leiden, Netherlands |
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| 2006 |
 Tartu, Estonia |
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| 2007 |
St. Petersburg, Russia |
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| 2008 |
Slanchev Bryag, Bulgaria |
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| 2009 |
 Wrocław, Poland |
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| 2010 |
 Stockholm, Sweden |
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| 2011 |
 Pittsburgh, United States of America |
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| 2012 |
 Ljubljana, Slovenia |
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| 2013 |
 Manchester, United Kingdom |
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| 2014 |
 Beijing, China |
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| 2015 |
Blagoevgrad, Bulgaria |
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| 2016 |
 Mysore, India |
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| 2017 |
 Dublin, Ireland |
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| 2018 |
 Prague, Czechia |
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| 2019 |
 Yongin, Republic of Korea |
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| 2021 |
 Ventspils, Latvia |
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| 2022 |
 Castletown, Isle of Man |
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| 2023 |
Bansko, Bulgaria |
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| 2024 |
 Brasília, Brazil |
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