Year	% of total teachers
1999	80.3650894165039
2001	84.6331100463867
2002	84.4776077270508
2006	80.2490310668945
2007	85.4908294677734
2008	83.2792510986328
2009	86.1053695678711
2010	87.9254837036133
2011	89.6801986694336
2013	95.7555084228516
2014	95.6694030761719
2015	96.3168411254883
2016	96.198600769043
2017	95.2722702026367
2018	96.0500564575195
2019	97.0022201538086
2020	96.6850967407227