Year	% of total teachers
2009	62.6726684570312
2010	64.0945205688477
2011	66.197868347168
2012	66.9963836669922
2013	67.1527709960938
2014	65.603401184082
2015	65.0664672851562
2016	63.1225204467773
2017	64.6949996948242
2018	63.0383605957031
2019	65.3006591796875
2020	65.7214126586914