Year	% of total teachers
2002	82.1268768310547
2003	79.28466796875
2004	75.2449264526367
2005	76.4203262329102
2006	77.6389694213867
2007	80.3953094482422
2008	80.1938705444336
2009	79.9178466796875
2010	78.8450317382812
2011	77.5695571899414
2012	80.7116928100586
2013	77.2521667480469
2014	75.9638595581055
2015	75.6429977416992
2016	75.3027877807617
2017	74.5787887573242
2018	74.0762405395508
2019	74.4396362304688
2020	74.2428283691406