At less than 1%, Mexico's share of top performers in science remains well behind the OECD average (8%). While Mexico has made significant progress in expanding access to ECEC in recent years, efforts should be continued to improve access to affordable and good-quality ECEC, particularly for children under the age of three. In 2002, ECEC was made compulsory starting at three years of age and while the enrolment of three-year-olds in ECEC has nearly doubled since 2005, only one in two three-year-olds (45.8%) was enrolled in 2015, lower than the OECD average of 77.8%.