In 2010, taking into account the hours worked by teachers, student-teacher ratios were 22.1, 18.6, 14.4 and 21.7 in the municipal, private subsidised, private non-subsidised, and delegated administration sectors respectively. Interestingly, while in the municipal sector the student-teacher ratio increased from 16.8 in 2004, it decreased significantly in the private subsidised sector from 30.0 in the same year (Ministry of Education, forthcoming). The latter is a teacher education institution mostly dedicated to training primary school teachers that ceased to exist in 1974.