1968
Sardegna, founding assembly
1971 Fontainebleau, France
1972 Paris, France
1973 Grenade, Spain
1974 Brussels, Belgium
1975 Zeist, Netherlands
1977 Kromeriz - Prague, Czech Republic
1978 Paris, France
1979 Bruges, Belgium
1979 Madrid - Seville, Spain
1980 Barcelona, Spain
1981 Stockholm, Sweden
1981 Florence, Italy
1982 Leningrad, Soviet Union
1982 Oxford - Great Britain
1983 Munich, Germany Federative Republic
1984 Bruges - Brussels, Belgium
1985 Versalles, France
1986 Copenhagen, Denmark 1987 Oxford, Great Britain
1988 Menton - La Napoule, France
1989 Potsdam, Germany Democratic Republic
1989 Barcelona, Spain
1990 Leiden, Netherlands
1990 Lausanne, Suisse
1991 Pisa, Italy
1992 Aranjuez, Spain
1993 Montréal, Canada
1994 Fulda, Germany Democratic Republic
1995 Pulstuk, Poland
1996 Worlitz, Germany
1997 Prague-Valtice-Cesky Krumlov, Czech Republic
1998 Aranjuez, Spain
1999 Berlin, Germany
2000 Naples, Italy
2001 Kesztehely - Visegrad, Hungary
2001 Buenos Aires, Argentine
2002 Madrid, Spain
2003 Berlin - Bad Muskau, Germany
2005 Brussels, Belgium
2005 Xian, China
2006 Coimbra, Portugal
2006 Verbania Pallanza, Italy
2007 Vienna / Austria
2007 San José de Costa Rica / Costa Rica
