Year	% of total teachers
1999	100
2000	100
2003	100
2004	100
2005	100
2006	100
2007	100
2008	100
2009	100
2011	72.4572067260742
2012	73.3629608154297
2013	73.2022933959961
2014	75.1394271850586
2015	75.4339904785156
2020	98.0603179931641
2021	100