Year	% of total teachers
2012	95.9301986694336
2013	94.8643264770508
2014	94.7896499633789
2015	93.3874206542969
2016	92.9359436035156
2017	91.614501953125
2018	91.0094299316406
2019	91.3832778930664
2020	89.6175308227539
2021	88.7868728637695
2022	88.3950424194336