Year	% of total teachers
2012	99.415397644043
2013	99.4925384521484
2014	99.3464431762695
2015	99.1361618041992
2016	99.0911178588867
2017	99.0311813354492
2018	98.991096496582
2019	99.0685577392578
2020	98.4818725585938
2021	97.8559265136719
2022	95.4467620849609