Year	% of total teachers
2002	97.1321716308594
2009	90.4066009521484
2010	87.8378372192383
2011	78.8199005126953
2012	79.6775588989258
2013	79.5812301635742
2014	78.9318771362305
2015	80.00537109375
2016	80.4919815063477
2017	81.9710006713867
2018	78.1345596313477
2019	75.8684005737305
2020	75.0894622802734
2021	74.6518783569336
2022	72.9281768798828