Year	% of total teachers
2005	85.1724090576172
2006	90.4582824707031
2007	81.6331329345703
2008	90.8312683105469
2009	88.4155578613281
2011	90.8819427490234
2012	92.3536224365234
2013	87.7828063964844
2014	91.3600006103516
2015	90.6676635742188
2016	91.1330032348633
2017	89.943000793457
2018	90.8130035400391
2019	90.3290023803711
2020	86.6781997680664