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Years of joining

1987: ABIDJAN, ARNHEM, ASSISI, ATLANTA, BANGUI, BEIJING, BRIGHTON & HOVE, BUENOS AIRES, CHICAGO, COMO, CONCORD, DAKAR, DELPHI, DHAKA, FIRENZE, GENÈVE, HAMMAM-LIF, HELSINKI, HIROSHIMA, KIEV, KOBENHAVN, KRAGUJEVAC, L’HOSPITALET DE LLOBREGAT, LA PAZ, LA PLAINE SUR MER, LIMA, LOME, MADRID, MAPUTO, MARRAKECH, MARZABOTTO, MELBOURNE, MINSK, MOSCOW, NAGASAKI, NEW DELHI , NEW HAVEN, PORI, PRAHA, RAVENNA, RIJSWIJK, ROMA, SAN FRANCISCO, SAN JOSE, SANKT-PETERBURG, SHEFFIELD, SOČI, SPLIT, STOCKHOLM, TBILISI, TORONTO, VANCOUVER, VERDUN, VILLA EL SALVADOR, VOLGOGRAD, WARSZAWA, WIEN, WOLLONGONG, YOKOHAMA
1988: KOŠICE, LIEGE, LISBOA, WROCŁAW
1989: ANTWERPEN, BOGOTA, SLOVENJ GRADEC, TASHKENT
1990: BERLIN, KRUŠEVAC
1991: BANDUNG, COVENTRY, QUITO, TOKYO, VLADIVOSTOK
1997: CAMBRIDGE (MA)
1998: OŚWIĘCIM, PŁOŃSK, LUBLIN
1999: MORPHOU, LIBREVILLE
2000: SUWON
2001: HAVANA
2004: MILTON KEYNES
2005: SARAJEVO, MILANO
2006: FREETOWN, JEJU
2007: PUEBLA
2008: KOTOR, KYRENIA, PAJU, WIELUN
2009: BARCELONA, CARACAS, KUMANOVO, MEXICO CITY, YPATI, ZAGREB
2010: KANTANOS, YAMOUSSOUKRO
2011: MESSOLONGHI, POLTAVA, TORUŃ
2012: BERANE