Year	% of total teachers
2005	79.0830993652344
2008	64.2161483764648
2009	60.597770690918
2010	58.3444290161133
2011	50.8521118164062
2012	56.4132308959961
2013	50.8975410461426
2014	53.0037994384766
2015	54.4043388366699
2016	58.6425285339355
2017	59.6002998352051
2018	61.7318496704102
2019	58.7634086608887