Year	% of total teachers
2003	30.6756801605225
2008	33.1325302124023
2010	25.26881980896
2013	40.6119613647461
2014	39.9484481811523
2015	41.8367309570312
2016	42.6908187866211
2017	44.5927886962891
2018	46.2833099365234
2020	39.266300201416
2022	38.735179901123