Year	% of total teachers
2009	65.3247909545898
2010	63.4348106384277
2011	57.333381652832
2012	60.8652191162109
2013	57.1500091552734
2014	61.444580078125
2015	63.5545501708984
2016	65.9728469848633
2017	66.453857421875
2018	67.6561584472656
2019	64.9429626464844