| 2024 | Leiden |
| 2022 | Uppsala |
| 2021 | Uppsala (online) |
| 2019 | Helsinki |
| 2017 | Leuven |
| 2015 | Paris |
| 2013 | London |
| 2011 | Parma |
| 2009 | Copenhagen |
| 2007 | Leiden/Amsterdam |
| 2005 | Uppsala |
| 2003 | Paris |
| 2001 | London |
| 1999 | Copenhagen |
| 1997 | Leiden/Amsterdam |
| 1995 | Uppsala |
| 1993 | London |
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