As of the 2010 Census, the population of the islands administered as Buru was 161,828 people, with about ⅔ in the northern regency and ⅓ in the southern;[20] this number also includes some other small islands to the south. In the early 2000s, most of the population was concentrated in the coastal areas,[21] and comprised the following major groups: indigenous Buru (33,000 people), Lisela (13,000), Ambelau (6,000) and Kayeli people (800); migrants from Java, and migrants from other Maluku Islands. The migration to Buru was stimulated by the Dutch colonial administration in the 1900s, and by Indonesian authorities in the 1950s–1990s. The local communities speak Buru, Lisela and Ambelau languages in everyday life, however, the national Indonesian language is used as a means of international communication. It is also used for writing, as none of the local languages (except for Buru) have a writing system. Also common is Ambon dialect of Malay language (Melayu Ambon). The latter is widely used in the Maluku Islands as a second language and is a simplified form of Indonesian language with additions of the local lexicon. Some local dialects, such as the Hukumina and Kayeli, became extinct in the second half of the 20th century.[22][23]