Year	% of total teachers
2011	70.6246719360352
2012	72.4154205322266
2013	76.950813293457
2014	80.862922668457
2015	82.0441436767578
2016	83.0224609375
2017	83.7211380004883
2018	83.9162673950195
2019	84.6695022583008
2020	85.7527084350586
2021	86.2743377685547
2022	88.2575836181641