Year	% of total teachers
2007	80.6247482299805
2008	77.8519973754883
2009	78.2084274291992
2011	78.0664215087891
2012	77.8037261962891
2018	78.6793670654297
2019	78.3240966796875
2020	78.6281967163086
2021	79.8391418457031
2022	78.8386764526367