Year	% of total teachers
1998	89.9253921508789
1999	94.1815719604492
2010	89.7149963378906
2012	92.6558609008789
2013	86.7099990844727
2014	85.1060028076172
2015	85.5530014038086
2016	86.5879974365234
2017	98.7502975463867