Year	% of total teachers
2000	54.3367309570312
2001	38.5255584716797
2003	40.8893699645996
2004	43.0579986572266
2006	36.5168495178223
2007	38.6239204406738
2008	36.4048309326172
2009	35.507251739502
2010	38.9972114562988
2012	41.9396286010742
2013	38.1483917236328
2015	49.8827705383301
2016	58.0362701416016
2018	62.3661994934082
2019	66.1308212280273
2020	70.3394470214844
2021	71.0454330444336
2022	71.4363403320312