Year	% of total teachers
2005	71.3376922607422
2006	72.7741165161133
2007	73.524169921875
2008	71.4082717895508
2009	70.2293472290039
2010	69.6054306030273
2011	70.4449462890625
2012	72.406379699707
2013	72.3672180175781
2014	71.5561981201172
2015	71.8081588745117
2016	71.5168609619141
2017	72.5546112060547