 Within the Banyarwanda people, there are three separate groups, the Hutu, Tutsi and Twa.The CIA "World Factbook" gives estimates that the Hutu made up 84% of the population in 2009, the Tutsi 15% and Twa 1%.The Twa are a pygmy people who descend from Rwanda's earliest inhabitants, but scholars do not agree on the origins of and differences between the Hutu and Tutsi.