Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla Duk sababbin mambobi sun kasance a cikin kungiyar a ci gaba tun lokacin da suka shiga, sai dai Spain da Yugoslavia.
Tabbas, sigar da ta fi rikitarwa ta jumla ita ce "Duk sabbin membobin sun ci gaba da kasancewa a cikin kungiyar ba tare da tsayawa ba tun lokacin da aka karbe su, sai dai Spain wacce ta shiga a 1961, ta janye shekaru takwas bayan haka, kuma ta sake shiga a 1983. "