Year	% of total teachers
1999	99.8705902099609
2000	98.5728073120117
2001	99.8245315551758
2002	99.6700897216797
2003	99.7036514282227
2004	99.7276763916016
2005	99.6904678344727
2006	99.6347885131836
2007	99.8026885986328
2008	99.8150405883789
2009	99.8555603027344
2010	99.8627624511719
2011	99.8723907470703
2012	99.888313293457
2016	86.0286102294922
2017	86.7609786987305
2018	87.300537109375
2019	89.11279296875
2020	89.6387786865234
2021	90.0184326171875