Year	% of total teachers
2006	85.3551483154297
2007	84.705451965332
2012	80.3793792724609
2013	77.7749481201172
2014	77.9894790649414
2015	79.1982803344727
2016	80.1594085693359
2017	81.3786392211914
2018	81.0330810546875
2019	76.3495330810547
2020	76.3252792358398
2021	77.2029571533203
2022	76.0418090820312