Before revision: The first world congress was held in 1975 in URL Subsequent hosts have been, 1978 | Florence, Italy 1981 | Birmingham, U.K. 1984 | Paris, France 1987 | Toronto, Canada 1990 | Cordoba, Spain 1993 | Treviso, Italy 1996 | Oaxaca, Mexico 1999 | Sydney, Australia 2002 | Buenos Aires, Argentina 2005 | Sevilla, Spain 2008 | Jerusalem, Israel 2011 | Genoa, Italy 2014 | Berlin, Germany 2017 | Verona, Italy 2019 | Montreal, Cana
After revision: The first world congress was held in 1975 in URL Subsequent hosts have been, 1978 | Florence, Italy 1981 | Birmingham, U.K. 1984 | Paris, France 1987 | Toronto, Canada 2022 | Marseilles, FranceMember organization include 18 national friends federations, 27 associate members (friends groups outside of a national URda 1990 | Cordoba, Spain 1993 | Treviso, Italy 1996 | Oaxaca, Mexico 1999 | Sydney, Australia 2002 | Buenos Aires, Argentina 2005 | Sevilla, Spain 2008 | Jerusalem, Israel 2011 | Genoa, Italy 2014 | Berlin, Germany 2017 | Verona, Italy 2019 | Montreal, Cana