Year	% of total teachers
2003	83.5713195800781
2004	83.3600006103516
2005	83.1503372192383
2007	82.7481536865234
2008	83.2420425415039
2009	92.5155715942383
2011	88.8634490966797
2015	90.0524826049805
2016	91.6209030151367
2017	91.5999984741211
2018	91.4526596069336