Year	% of total teachers
2004	94.5038223266602
2005	94.9344329833984
2006	95.1533279418945
2007	95.3685684204102
2008	95.0464935302734
2009	95.5881576538086
2010	95.5859069824219
2011	96.0000534057617
2012	95.9999313354492
2013	82.8928070068359
2014	83.5270919799805
2015	84.404541015625
2016	85.6662216186523
2017	86.4588928222656
2018	87.5402374267578
2019	88.5938568115234
2020	90.2846832275391
2021	90.9365615844727