Year	% of total teachers
1999	77.5016784667969
2000	79.1495971679688
2001	78.0742874145508
2002	82.9657897949219
2003	82.7328262329102
2004	84.5256500244141
2005	83.7140808105469
2006	89.8609390258789
2007	90.4952163696289
2008	88.6552581787109
2009	90.2028732299805
2010	90.9000396728516
2011	91.6777572631836
2012	91.7216110229492
2014	86.2621078491211
2015	91.1610870361328
2016	87.9892196655273
2018	91.0133972167969
2019	91.7506408691406
2020	91.1886596679688
2021	91.2951889038086
2022	90.9596176147461