2025
Lisbon, Portugal
2023
Washington D.C.
2019
Hong Kong
2016
Hamburg, Germany
2013
Sydney, Australia
2010
Seattle, USA
2007
Beijing, China
2004
Warsaw, Poland
2001
Waterloo, Canada
1998
Würzburg, Germany
1995
Osaka, Japan
1990
Baton Rouge, USA
1986
Lyngby, Danmark
1983
Kent, UK
1980
Berlin, Germany