Year	% of total teachers
2009	93.1209106445312
2010	92.8733673095703
2011	93.5306777954102
2012	93.7166366577148
2013	93.9254302978516
2014	93.824089050293
2015	93.0670776367188
2016	92.1139907836914
2017	91.0112075805664
2018	91.2278594970703
2019	90.2700881958008
2020	85.6837463378906