Year	% of total teachers
1999	31.25
2000	31.4960594177246
2001	31.578950881958
2002	40
2003	27.8637790679932
2004	36.3057289123535
2005	30.9859199523926
2006	26.7206497192383
2007	37.6470603942871
2008	31.8181800842285
2009	32.3943710327148
2010	33.6769790649414
2011	37.0106811523438
2014	46.1538505554199
2016	48.3754501342773