Year	% of total teachers
2009	55.5263710021973
2010	49.5906715393066
2011	45.0051689147949
2012	46.4057884216309
2013	52.0308609008789
2014	56.1473617553711
2015	62.8381309509277
2016	64.8113174438477
2017	68.7229080200195
2018	69.3659896850586
2019	64.8091506958008
2020	62.2120094299316
2021	60.5635604858398