Year	% of total teachers
2001	72.1482925415039
2003	77.3345413208008
2004	77.8095169067383
2005	79.9627227783203
2006	79.8434371948242
2007	82.1465377807617
2008	87.8323135375977
2009	87.6360015869141
2010	86.7744979858398
2011	86.7413635253906
2012	87.7609100341797
2019	87.4079971313477
2020	86.0400009155273
2021	83.1190032958984
2022	81.4061126708984