1st 1920 London, England
2nd 1922 Paris, France
3rd 1924 Oslo, Norway
4th 1926 Amsterdam, The Netherlands
5th 1929 Geneva, Switzerland
6th 1932 Edinburgh, Scotland
7th 1936 Cracow, Poland
8th 1939 Stockholm, Sweden
9th 1947 Toronto, Canada
10th 1950 Zurich, Switzerland
11th 1953 London, England
12th 1956 Paris, France
13th 1959 Helsinki, Finland
14th 1962 Mexico City, Mexico
15th 1965 Brisbane, Australia
16th 1968 Karlsruhe, Germany
17th 1971 Pennsylvania, Philadelphia, USA
18th 1974 Kyoto, Japan
19th 1977 Stirling, Scotland
20th 1980 Vancouver, Canada
21st 1983 Groningen, The Netherlands
22nd 1986 Christchurch, New Zealand
23rd 1989 Helsinki-Espoo, Finland
24th 1992 Palo Alto, California, USA
25th 1995 Yokohama, Japan
26th 1998 Graz, Austria
27th 2001 Ottawa, Canada
28th 2004 Perth, Australia
29th 2007 Manchester, England
30th 2010 Mexico City, Mexico
31st 2013 Istanbul, Turkey
