Year	% of total teachers
2012	89.7024993896484
2013	89.7942886352539
2014	90.0132064819336
2015	89.8300323486328
2016	88.7982330322266
2017	90.6377182006836
2018	88.931282043457
2019	87.8532485961914
2020	87.5102462768555
2021	87.160758972168
2022	85.2415466308594