Year	% of total teachers
2009	59.9053802490234
2010	64.1051635742188
2011	61.2428703308105
2012	56.3876800537109
2013	55.7073097229004
2014	53.5964698791504
2015	53.7478790283203
2016	50.2686805725098
2017	51.1622581481934
2018	50.0858306884766
2019	54.5765686035156
2020	57.4340400695801