Year	% of total teachers
2009	58.0410385131836
2010	51.5355987548828
2011	45.5014991760254
2012	46.995548248291
2013	47.401008605957
2014	47.2953605651855
2015	59.6402397155762
2016	62.1163101196289
2017	66.196907043457
2018	68.0994110107422
2019	62.4246215820312