I. Düsseldorf, Germany 1990
II. Lausanne, Switzerland 1992
III. Stockholm, Sweden 1994
IV. Bordeaux, France 1995
V. Munich, Germany 1996
VI. Amsterdam, The Netherlands 1997
VII. Edinburgh, United Kingdom 1998
VIII. Venice, Italy 1999
IX. Vienna, Austria 2000
X. Lisbon, Portugal 2001
XI. Geneva, Switzerland 2002
XII. Valencia, Spain, 21-24 May 2003
XIII. Mannheim-Heidelberg, Germany, 12-15 May 2004
XIV. Bologna, Italy, 25-28 May 2005
XV.Brussels, Belguim 16-19 May 2006 2006
XVI. Glasgow, United Kingdom 29 May – 1 June 2007
XVII. Nice, France 13-16 May 2008
XVIII. Stockholm, Sweden 26-29 May 2009
XIX. Barcelona, Spain 25 - 28 May 2010