Year	% of total teachers
2011	15.7384996414185
2012	20.6422004699707
2013	21.3302803039551
2014	30.3097305297852
2015	40.4395599365234
2016	45.2328186035156
2017	39.3409996032715
2018	46.7561492919922
2019	52.0833282470703
2020	57.7669906616211
2021	67.6165771484375
2022	71.2820510864258