1999 - Freiburg, Germany 1999 - Freiburg, Germany 2000 - Freiburg, Germany 2000 - Freiburg, Germany 2001 - Stockholm, Sweden 2002 - Tahiti, French Polynesia 2002 - Richland, Washington, United States 2003 - Ottawa, Canada 2004 - Strassoldo, Italy 2005 - Stockholm, Sweden 2006 - Melbourne, Australia 2007 - Las Vegas, Nevada, United States 2008 - St. Petersburg, Russian Federation 2009 - Daejeon, South Korea 2010 - Buenos Aires, Argentina 2011 - Yogyakarta, Indonesia 2012 - Mito, Japan 2013 - Vienna, Austria 2015 - Austin, Texas, United States 2017 - London, United Kingdom 2019 - Freiburg, Germany