Year	% of total teachers
2003	89.9893112182617
2004	89.5400924682617
2005	89.0378494262695
2007	88.0525894165039
2008	87.5121994018555
2009	92.8179931640625
2011	91.4562606811523
2015	92.0418090820312
2016	92.7774124145508
2017	92.5625762939453
2018	92.4556198120117