| 1-23 |
1963-1988 |
Watford and other locations, UK |
| 24 |
1989 |
Lugano, Switzerland |
| 25 |
1990 |
Malicorne, France |
| 26 |
1991 |
Finse, Norway |
| 27 |
1992 |
Madrid, Spain |
| 28 |
1993 |
Rotterdam, Netherlands |
| 29 |
1994 |
Williamsburg, USA |
| 30 |
1995 |
Giessbach, Switzerland |
| 31 |
1996 |
Hindsgavl, Denmark |
| 32 |
1997 |
Vienna, Austria |
| 33 |
1998 |
Bilbao, Spain |
| 34 |
1999 |
Lillafüred, Hungary |
| 35 |
2000 |
Sund, Sweden |
| 36 |
2001 |
Avignon, France |
| 37 |
2002 |
Westport, Ireland |
| 38 |
2003 |
Dessau, Germany |
| 39 |
2004 |
Basel, Switzerland |
| 40 |
2005 |
Copenhagen, Denmark |
| 41 |
2006 |
Tokyo, Japan |
| 42 |
2007 |
Utrecht / Brussels, Netherlands / Belgium |
| 43 |
2008 |
Vienna, Austria |
| 44 |
2009 |
Ronda, Spain |
| 45 |
2010 |
Strasbourg, France |
| 46 |
2011 |
New York, USA |
| 47 |
2012 |
Potsdam, Germany |
| 48 |
2013 |
Coventry, United Kingdom |
| 49 |
2014 |
Amsterdam, Netherlands |
| 50 |
2015 |
Düsseldorf, Germany |
| 51 |
2016 |
Copenhagen / Malmö, Denmark / Sweden |
| 52 |
2017 |
Madrid, Spain |
| 53 |
2019 |
Paris, France |
| 54 |
2022 |
Singapore, Singapore |
| 55 |
2025 |
London, United Kingdom |
