Year	% of total teachers
2007	83.7567977905273
2008	81.9166793823242
2009	81.0520629882812
2010	78.7276611328125
2011	76.5953674316406
2012	76.7553329467773
2013	81.5635070800781
2014	82.6362380981445
2015	81.1696701049805
2016	84.484992980957
2017	87.2185897827148
2018	86.9866790771484
2019	87.5898590087891
2020	85.6793899536133
2021	85.1126327514648