Year	% of total teachers
2007	99.164436340332
2008	98.8888931274414
2009	98.5591506958008
2016	98.9958114624023
2017	98.9980621337891
2018	98.2631607055664
2019	97.8361968994141
2020	98.1883392333984
2021	98.0147705078125