Finnish and Swedish are the official languages. More than 93 % of the population speaks Finnish, a Finno-Ugric language . About 6 % of the people, concentrated largely in the Ahvenanmaa archipelago, speak Swedish. The Saami speak Saami, a dialect of Finnish. The Evangelical Lutheran Church of Finland is the principal national church, and its members make up 89 % of the population; freedom of worship is, guaranteed to all faiths. The Orthodox Church, still a national church, has sharply decreased in numbers since World War II (1939-1945).