Santiago 2009
2,389 participants from 70 countries.

Fukuoka 2006     
1,925 participants from 76 countries.

Durban 2003
1,011 participants from 69 countries.

Quebec 2000    
1,849 participants from 73 countries.

Seoul 1997    
1,470 participants from 72 countries.

Berlin 1994    
1,884 participants from 73 countries.

Buenos Aires 1991    
1,400 participants from 55 countries.

Washington 1988    
1,265 participants from 65 countries.

Paris 1985    
1,763 participants from 66 countries.

Rio de Janeiro 1982    
1,477 participants from 49 countries.

Moscow 1979
1,466 participants from 53 countries.

Edinburgh 1976   
1,081 participants from 56 countries.

Montreal 1973    
1,044 participants from 56 countries.

Munich 1970    
894 participants from 46 countries.

Brussels 1967    
745 participants from 56 countries.

Geneva 1964   
494 participants from 43 countries.

Paris 1961   
425 participants from 46 countries.

Rome 1958   
320 participants from 31 countries.

Stockholm 1955   
275 participants from 36 countries.

Hague 1952   
220 participants from 31 countries.

Zurich 1950    
81 participants from 23 countries.

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