2018, Moscow, Russia

2016, Manizales, Colombia

2014, Liège, Belgium 

2012, Minsk, Belarus

2011, Manila, Philippines (conference)

2010, Leicester, United Kingdom

2008, Puebla, Mexico

2006, Urbino, Italy

2003, Olympia, Greece

2001, Krakow, Poland

1999, Dakar, Senegal

1997, Valleyfield, Quebec, Canada

1994, Liège, Belgium