Year	% of total teachers
2009	62.8196792602539
2010	61.4447593688965
2011	59.7578887939453
2012	59.3707313537598
2013	59.170768737793
2014	59.0303001403809
2015	61.0936889648438
2016	61.9705390930176
2017	63.2591285705566
2018	65.2934188842773
2019	62.6146087646484