Ethnic Bulgarians in present-day Albania live mostly in the areas of Mala Prespa and Golo Bardo. In the 1989 census a total of 782 people claimed either Romanian, Bulgarian or Czechoslovakian nationality. The US Department of State background note for Albania, dated 4 January 2011 further reported that the population is composed of various ethnic groups including Bulgarians. The Encyclopaedia of the Nations in its section on Albania's ethnic groups, undated, also has included Bulgarians. The CIA World Factbook 2011 has also counted Bulgarians in Albania. The State Agency for Bulgarians Abroad states that about 40,000 to 50,000 persons of Bulgarian origin are living in Albania, but another Bulgarian source estimates their number at about 100,000. Most Slavic speakers in Albania were converted to Islam during the centuries when the Ottoman Empire ruled the Balkans. There is also a lack of stable ethnic consciousness of this population who easily change their allegiance from Albanian to either Bulgarian or ethnic Macedonian depending on the benefits expected.