| 2009 | Stuttgart, Germany |
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| 2008 | Kyoto, Japan | |||
| 2007 | Turku, Finland | Volume 4588 | ||
| 2006 | Santa Barbara, California, USA | Volume 4036 | ||
| 2005 | Palermo, Italy | Volume 3572 | ||
| 2004 | Auckland, New Zealand | Volume 3340 | ||
| 2003 | Szeged, Hungary | Volume 2710 | ||
| 2002 | Kyoto, Japan | Volume 2450 | ||
| 2001 | Vienna, Austria | Volume 2295 | ||
| 1999 | Aachen, Germany | |||
| 1997 | Thessaloniki, Greece | |||
| 1995 | Magdeburg, Germany | |||
| 1993 | Turku, Finland |