Year	% of total teachers
2006	80.0244293212891
2007	80.9673004150391
2008	80.5202713012695
2009	80.2775192260742
2010	80.1803512573242
2011	80.1830596923828
2012	80.2458190917969
2013	77.0929183959961
2014	77.4378890991211
2015	78.0910568237305
2016	78.4826889038086
2017	78.5882720947266
2018	78.2830810546875
2019	78.8844223022461
2020	79.4660415649414
2021	79.8857498168945
2022	79.5104598999023