Year	% of total teachers
2006	82.8067474365234
2007	76.9285583496094
2008	67.9660263061523
2009	66.6326217651367
2010	57.5684585571289
2011	46.1790084838867
2012	54.9458999633789
2013	49.2513694763184
2014	54.7507209777832
2015	57.3279914855957
2016	65.3171234130859
2017	67.6413803100586
2018	71.3600234985352
2019	65.3340377807617