Year	% of total teachers
2013	77.2470397949219
2014	77.3822326660156
2015	78.6399536132812
2016	79.6900863647461
2017	80.9344100952148
2018	80.5815505981445
2019	75.7961578369141
2020	75.7720031738281
2021	76.6410217285156
2022	75.463020324707