Year	% of total teachers
2000	78.5344085693359
2001	77.9402770996094
2004	77.5057220458984
2005	78.5185699462891
2006	79.7027893066406
2007	79.8392028808594
2008	78.4847106933594
2009	78.9768295288086
2010	78.0927581787109
2011	77.3989105224609
2012	77.7271423339844
2013	77.2772598266602
2014	76.2110595703125
2015	75.4458465576172
2016	74.9626922607422
2017	74.1718063354492
2018	74.031982421875
2019	73.7430877685547
2020	72.653450012207
2021	73.503547668457