1. Tours (France) 1961

  2. Bad Kreuznach (Germany) 1964

  3. Bratislawa (Czechoslovakia) 1966

  4. Usuda (Japan) 1969

  5. Vema (Bulgaria) 1972

  6. Cambridge (U.K) 1975

  7. Salt Lake City (USA) 1978

  8. Avignon (France) 1981



  1. Christchurch (New Zealand) 1984

  2. Pecs (Hungary) 1987

  3. Beijing (China) 1993

  4. Stockholm (Sweden) 1994

  5. Iowa (USA) 1998

  6. Pecs (Hungary) 2000

  7. Ayudhaya (Thailand) 2003

  8. Lodi (Italy) 2006