- 2012, Piaski-Mazury, Poland
- 2009, Mar del Plata, Argentina
- 2006, Latina, Italy
- 2004, Barcelona, Spain
- 2001, Nakon Nayok, Thailand
- 1998, Antigua, Guatemala
- 1995, Marysville, Australia
- 1992, Chedigny, France
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- 1989, Montreal, Canada
- 1986, Rome, Italy
- 1983, Nahariya, Israel
- 1980, Anand Niketan Ashram, India
- 1978, Elsinore, Denmark
- 1976, Los Angeles, U.S.A.
- 1974, Arcegno, Switzerland
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- 1972, Wetzlar, Germany
- 1970, Vienna, Austria
- 1968, Tokyo, Japan
- 1967, Zochova Hata (Nr. Bratislava), Czechoslovakia
- 1966, Copenhagen, Denmark
- 1965, Vienna, Austria
- 1964, Paris, France
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- 1960, Ghent, Belgium
- 1959, Osterwyk, Netherlands
- 1958, Landeck (Tyrol), Austria
- 1955, Schluchsee (Black Forest), Germany
- 1954, Epe, Netherlands
- 1953, Askov, Denmark
- 1952, Germany SI News No:21
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