Year	% of total teachers
2005	64.365966796875
2006	68.5805435180664
2007	66.4864883422852
2008	66.996696472168
2009	70.9731521606445
2010	72.9729690551758
2011	63.7372817993164
2012	65.3167190551758
2013	63.1958808898926
2014	64.3769989013672
2015	58.9220008850098
2016	59.435001373291
2017	59.1119995117188
2018	61.5130004882812
2019	63.7190017700195
2020	58.0900001525879