Year	% of total teachers
2005	75.1230392456055
2006	70.4854431152344
2007	71.0252914428711
2008	66.346549987793
2009	66.2909088134766
2010	66.8335189819336
2011	57.7781410217285
2012	62.3906517028809
2013	55.3569793701172
2014	57.5987014770508
2015	59.4442710876465
2016	62.7629013061523
2017	61.9512596130371
2018	63.0417289733887
2019	62.6540603637695