The census covered teachers working in public institutions maintained by the National Public Education Administration (ANEP) only. Hence, data for early childhood and pre-primary education do not include teachers in schools managed by the Ministry of Education and Culture (MEC) and by the Child and Adolescent Institute of Uruguay (INAU). Also data on technical-professional programmes include teachers in programmes at the tertiary level (a minor proportion of programmes supervised by CETP). In public primary education, the average size of classes has decreased over the last decade to 24 students in 2012.