Year	% of total teachers
1998	68.8770065307617
1999	66.6666717529297
2000	66.4510192871094
2001	66.9413604736328
2002	63.8229293823242
2003	60.8122901916504
2005	64.2956314086914
2006	67.5959167480469
2007	65.8677368164062
2008	67.9245300292969
2009	74.0919418334961
2010	76.0410003662109
2011	80.7630004882812
2012	77.4739990234375
2013	90.120002746582
2014	86.056999206543
2015	82.7979965209961
2016	85.7239990234375
2017	90.1350021362305
2018	92.0780029296875
2019	88.8276901245117