Year	% of total teachers
1998	79.2499008178711
1999	78.4569320678711
2000	78.7215194702148
2001	82.6090393066406
2002	84.0554885864258
2003	86.197509765625
2010	80.3819580078125
2011	81.8197021484375
2012	74.2328414916992
2013	76.0442428588867
2014	73.6022262573242
2019	65.6294021606445
2020	70.7591781616211
2021	75.7285690307617