2019 Los Angeles, USA
2017 Sydney, Australia
2015 Paris, France
2013 Cleveland USA
2011 Buenos Aires Argentina
2009 Cambridge England
2007 Siena Italy
2005 Whistler Canada
2004 Hyderabad India
2001 Amsterdam The Netherlands
1999 Philadelphia USA
1997 Jerusalem Israel
1994 Florence Italy
1992 New York City USA
1989 Essen Germany
1987 Zusdel/Moscow Russia
1984 Nyon Switzerland
1981 Schwerin East Germany
1977 Cambridge England