Year	% of total teachers
2002	7.17761993408203
2003	7.70171022415161
2004	6.70795011520386
2005	7.90598011016846
2006	11.4736795425415
2007	17.6056308746338
2008	25.9727592468262
2009	26.711669921875
2010	26.5324802398682
2011	32.1684608459473
2012	45.6424102783203
2014	48.5211791992188
2016	30.3975105285645
2017	29.4941596984863
2018	29.616720199585
2019	30.0890998840332
2020	30.2687397003174