17th: Vancouver, Canada (2022)
16th: Dublin, Ireland (2018)
15th: Seoul, South Korea (2016)
14th: San Francisco, US (2014)
13th: Warsaw, Poland (2012)
12th: Beijing, China (2010)
11th: Montreal (2008)
10th: Mainz (2006)
9th: Evanston (2004)
8th: Tokyo (2002)
7th: Cambridge (2000)
6th: Boulder (1998)
5th: Naples (1996)
4th: San Diego (1994)
3rd: Sydney (1992)
2nd: Paris (1990)
1st: Berkeley (1988)