Year	% of total teachers
2006	64.4094161987305
2007	62.4336891174316
2008	65.0014266967773
2009	72.8150482177734
2010	75.2971115112305
2011	79.7754364013672
2012	84.1466674804688
2013	86.869270324707
2014	88.7696228027344
2015	84.9260406494141