Year	% of total teachers
1998	75.552490234375
2002	81.4902420043945
2010	94.8939971923828
2011	98.3119964599609
2012	93.8769989013672
2013	98.8489990234375
2014	92.1029968261719
2015	93.4049987792969
2016	94.8639984130859
2017	96.5309982299805
2018	98.3359985351562
2019	93.5656204223633