Year	% of total teachers
2002	98.7353591918945
2005	90.6131134033203
2006	89.8006973266602
2007	85.9397430419922
2008	87.4079513549805
2009	85.9712219238281
2010	89.0024719238281
2011	85.8439788818359
2012	82.2000885009766
2013	79.8602523803711
2014	81.5311813354492
2015	84.6681900024414
2016	84.8384399414062
2017	84.6681900024414
2018	83.0547790527344
2019	84.719856262207
2021	89.4479064941406