Year	% of total teachers
1999	38.354850769043
2000	37.5787582397461
2001	40.1076698303223
2003	45.8650016784668
2005	48.4252014160156
2007	52.5362281799316
2008	55.3424682617188
2009	59.4308013916016
2010	60.8503608703613
2011	62.9354705810547
2012	65.1710586547852
2013	69.4919967651367
2014	69.6630020141602
2015	67.3690032958984
2016	68.5979995727539
2017	69.0910034179688
2018	70.197998046875
2019	69.7760009765625
2020	66.6360015869141