Year	% of total teachers
2004	18.1861991882324
2005	22.3089294433594
2006	17.02419090271
2007	14.4234399795532
2009	19.0905895233154
2010	18.1112003326416
2012	33.0945281982422
2014	36.1985282897949
2016	50.1337089538574