| Year |
Number |
Location |
|
| 2012 |
15th |
University of Wisconsin, Madison, Wisconsin, USA |
|
| 2010 |
14th |
University of Pisa, Italy |
cache |
| 2009 |
13th |
Tsinghua University, Beijing, China |
cache |
| 2007 |
12th |
University of Massachusetts, Amherst, Massachusetts, USA |
cache |
| 2006 |
11th |
TU Wien, Vienna, Austria |
|
| 2004 |
10th |
Purdue University, West Lafayette, Indiana, USA |
cache |
| 2003 |
9th |
Villa Mondragone, Monte Porzio Catone (Rome), Italy |
cache |
| 2001 |
8th |
University of Illinois Urbana-Champaign, Illinois, USA |
cache |
| 2000 |
7th |
University of Glasgow, Glasgow, Scotland |
cache |
| 1998 |
6th |
Osaka University, Osaka, Japan |
|
| 1997 |
5th |
Notre Dame University, Indiana, USA |
cache |
| 1995 |
4th |
Arizona State University, Arizona, USA |
|
| 1994 |
3rd |
Portland, Oregon, USA |
|
| 1993 |
2nd |
University of Leeds, Leeds, United Kingdom |
|
| 1992 |
1st |
University of Illinois Urbana-Champaign, Illinois, USA |
|
