Year	% of total teachers
2000	88.6352386474609
2001	86.8242797851562
2002	87.3477172851562
2003	83.67041015625
2004	77.3549728393555
2005	76.3084030151367
2006	77.7396621704102
2007	79.8077774047852
2008	79.1119003295898
2009	78.5295333862305
2010	76.0755310058594
2011	74.6656723022461
2012	78.551139831543
2013	74.1380004882812
2014	72.588752746582
2015	72.7140502929688
2016	72.5547485351562
2017	71.2479934692383
2018	70.5226287841797
2019	71.0087280273438
2020	70.8356094360352