Well, to put it into perspective, they joined during very different political and economic times: the Danes in the late 60s and the Swedes and Finns right after

Well, to put it into perspective, they joined during very different political and economic times: the Danes in the late 60s and the Swedes and Finns right after the Wall came down. Edit: Looks like Denmark applied in 1969 and was admitted in the early 1970s.