2008: Novosibirsk, Russia

2006: Pisa, Italy

2004: Nara, Japan

2002: Santa Cruz, California, USA

2000: Victoria, British Columbia, Canada

1998: Santander, Spain

1996: Estes Park, Colorado, USA

1994: Montreux, Switzerland

1992: Columbus, Ohio, USA

1990: Orsay, France