Year	% of total teachers
2012	28.310230255127
2013	27.1817493438721
2014	32.6619987487793
2015	39.9016990661621
2016	50.9339790344238
2017	52.9155807495117
2018	58.4515419006348
2019	59.5846710205078
2020	67.6892929077148
2021	73.5800018310547
2022	76.6780014038086