Year	% of total teachers
2006	18.246509552002
2008	12.8154897689819
2009	14.0076303482056
2010	15.094030380249
2012	23.4217891693115
2013	25.7148094177246
2014	25.7461700439453
2015	26.0958099365234
2018	37.8110008239746
2019	37.7977714538574
2020	37.3582191467285
2021	38.8188781738281
2022	37.701488494873