Enrolment in ECEC in Portugal is above the OECD average in 2012: 78% of 3-year-olds and 92% of 4-year-olds are enrolled at pre-primary level (compared to the OECD average of 70% for 3-year-olds and 82% for 4-year-olds), and enrolment is practically universal between ages 5 and 14. Education is compulsory from ages 6 to 18 in Portugal (two years more than the OECD average), with comprehensive schooling (the same curriculum for all students) until age 15. National data shows an increase of 33% in the inclusion in regular schools of students with special education needs (SEN) (2010/11). In PISA 2012, about 34.3% of 15-year-olds in Portugal had repeated at least one grade, compared to the OECD average of 12%.