Nigeria provides free, government-supported education, but attendance is not compulsory at any level, and certain groups, such as nomads and the handicapped, are under-served. The education system consists of six years of primary school, three years of junior secondary school, three years of senior secondary school, and four, five or six years of university education leading to a bachelor's degree. The government has majority control of university education. Tertiary education in Nigeria consists of universities (public and private), polytechnics, monotechnics, and colleges of education. The country has a total of 138 universities, with 40 federally owned, 39 state-owned, and 59 privately owned. Nigeria was ranked 117th in the Global Innovation Index in 2020, down from 114th in 2019.