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Leipzig 1970
St. Gallen 1971
Bologna 1972
London 1973
Jerusalem 1974
Bergen 1976
Mainz 1977
Lissabon 1978
Saizburg 1979
Cambridge 1980
Budapest 1981
Brussels 1982
Washington 1983
Como 1984
Ost-Berlin 1985
Stockholm 1986
Amsterdam 1987
Wien 1988
Oxford 1989
Ottawa 1990
Sopron 1991
Canberra 1992
Helsinki 1993
Bogensee 1994
Washington 1995
Perugia 1996
Muscat 1997
Paris 1998
Wien 1999
Singapore 2000
London 2001
Aarhus 2002
Pretoria 2003
Oslo 2004
Barcelona 2005
Mexico City 2006
Riga 2007
Sydney 2008
Athens 2009
