Year	% of total teachers
1999	77.6535720825195
2000	80.0496368408203
2001	84.9499588012695
2002	87.0124435424805
2005	93.3701019287109
2006	95.639518737793
2007	97.793327331543
2008	98.6272430419922
2009	99.6399536132812
2010	98.3349990844727
2011	99.3030014038086
2012	99.5879974365234
2014	100
2015	99.4759979248047
2016	99.7740020751953
2017	99.7202224731445
2018	99.8679962158203
2019	99.5210037231445
2020	99.6780014038086