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- Amsterdam, the Netherlands - 2019
- Santiago, Chile - 2017
- Seoul, Korea - 2015
- Turin, Italy - 2013
- Hawaii, Big Island - 2011
- Cape Town, South Africa - 2009
- Fukuoka, Japan - 2007
- Crete, Greece - 2005
- Halifax, Nova Scotia - 2003
- Sydney, Australia - 2001
- Stockholm, Sweden - 1999
- Malta - 1997
- San Diego, CA - 1995
- Burgenstock, Switzerland - 1993
- Hiroshima, Japan - 1991
- Toronto, Canada - 1989
- Interlaken, Switzerland - 1987
- Seattle, Washington - 1985
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