Year	% of total teachers
2006	81.6224594116211
2007	81.7975921630859
2008	80.2801208496094
2009	78.8066177368164
2010	79.1185607910156
2011	78.6424026489258
2012	77.868766784668
2013	76.0236129760742
2014	76.4876403808594
2015	74.0536499023438
2016	73.9916534423828
2017	74.3134765625
2018	74.2969284057617
2019	77.8742828369141
2020	75.9108428955078
2021	77.7391586303711
2022	75.2601623535156