Year	% of total teachers
2003	55.3790588378906
2004	50.8420600891113
2005	45.6977081298828
2006	49.6953506469727
2007	46.038688659668
2008	46.1838111877441
2009	42.5605506896973
2010	47.8528518676758
2011	63.1021881103516
2012	64.7217712402344
2013	72.3790893554688
2014	69.9682235717773
2015	68.3398208618164
2019	75.3395233154297
2020	75.0538024902344
2021	75.5847702026367
2022	71.7588272094727