Query: In the 2001 census, how much of Bolivia's population was labeled as being indigenous?
Context: In Bolivia, a 62% majority of residents over the age of 15 self-identify as belonging to an indigenous people, while another 3.7% grew up with an indigenous mother tongue yet do not self-identify as indigenous. Including both of these categories, and children under 15, some 66.4% of Bolivia's population was registered as indigenous in the 2001 Census. The largest indigenous ethnic groups are: Quechua, about 2.5 million people; Aymara, 2.0 million; Chiquitano, 181,000; Guaraní, 126,000; and Mojeño, 69,000.