Year	% of total teachers
2007	81.565803527832
2008	80.5142517089844
2009	80.9271469116211
2010	81.7128677368164
2011	82.4932632446289
2012	80.1530914306641
2013	75.6511077880859
2014	76.2743835449219
2015	77.1725082397461
2016	77.4723968505859
2017	77.3532333374023
2018	76.4952926635742
2019	76.8827514648438
2020	77.1197128295898
2021	76.780403137207
2022	74.5552673339844