 Nyorai kupfuurira kweiyi ndima - Ireland neDenmark zvose zvakabata referendamu muna 1972 muna May naOctober zvichiteerana, uye United Kingdom yakabata referendamu muna 1975, pamusoro pekuva nhengo yeEC, zvose izvo zvakabvumira kuva nhengo yeEC. Norway yakaronga kujoina, asi ikoku kwakarambwa murondedzero yakaitwa muna September 1972. Muna 1992 Norway yakakumbirazve kujoina, asi vavhoti vakarambazve chikumbiro chacho murondedzero ya1994. 