Year	% of total teachers
2012	90.2716369628906
2013	90.3862991333008
2014	89.4197235107422
2015	88.8216934204102
2016	87.944580078125
2017	90.1591186523438
2018	88.8380966186523
2019	87.742073059082
2020	85.9997863769531