(Thanks to Michael Trott.)
| 1st | January 11-13, 1990 | Redwood City, California, USA |
| 2nd | January 12-15, 1991 | San Francisco, California, USA |
| 3rd | May 27-31, 1992 | Boston, Massachusetts, USA |
| 4th | September 2-4, 1992 | Rotterdam, Netherlands |
| 5th | April 21-23, 1994 | Champaign, Illinois, USA |
| 1st Australian | July 8-10, 1995 | University of Tasmania, Hobart, Australia |
| 1st | May 6-8, 1993 | Champaign, Illinois, USA |
| 2nd | October 6-8, 1995 | Champaign, Illinois, USA |