School attendance has increased over the years. In 1950, Mexico had only three million students enrolled in education. In 2011, there were 32 million enrolled students. The 1960 national census illustrates the historically poor performance of the Mexican educational system. The 1960 census found that as to all Mexicans over the age of five, 43.7% had not completed one year of school, 50.7% had completed six years or less of school, and only 5.6% had continued their education beyond six years of school. In 2015, 96.2% of six to fourteen year-olds attended school, up from 91.3% in 2000. The state with the highest attendance rate was Hidalgo (97.8%) and the state with the lowest attendance rate was Chiapas (93%). In the same year, 63% of three to five year-olds attended preschool or kindergarten, up from 52.3% in 2010. Also in 2015, 44% of 15 to 24 year-olds attended secondary or tertiary school, an increase from 32.8% in 2000.