Rwanda has been governed as a unitary presidential system with a bicameral parliament ruled by the RPF since 1994 with former commander Paul Kagame as President since 2000. The country has been governed by a series of centralized authoritarian governments since precolonial times. Although Rwanda has low levels of corruption compared with neighbouring countries, it ranks among the lowest in international measurements of government transparency, civil liberties and quality of life. The population is young and predominantly rural; Rwanda has one of the youngest populations in the world. Rwandans are drawn from just one cultural and linguistic group, the Banyarwanda. However, within this group there are three subgroups: the Hutu, Tutsi and Twa. The Twa are a forest-dwelling pygmy people and are often considered descendants of Rwanda's earliest inhabitants. Christianity is the largest religion in the country; the principal and national language is Kinyarwanda, spoken by native Rwandans, with English, French and Swahili serving as additional official foreign languages.
