Education is free and compulsory for children between the ages of 6 and 16, and an additional two years of free education are optional. In 1997, 101 % of Malaysian children attended primary school. Parents may choose between Bahasa Malaysia, Chinese, or Tamil as the language of instruction for their primary-school children. Bahasa Malaysia is the primary language of instruction in all secondary schools, although continued learning in Chinese and Tamil is available and English is a compulsory second language. Enrollment in secondary education was 64 % in 1997. Malaysia has a number of institutions of higher education, including nine universities. Universities include the National University, in Bangi; the University of Technology, in Johor Baharu; and the University of Malaya, in Kuala Lumpur.