Year	% of total teachers
1999	93.728141784668
2000	94.6377334594727
2001	95.6770172119141
2002	97.1265411376953
2003	97.9197616577148
2004	98.3455963134766
2005	98.5262832641602
2006	99.267219543457
2007	98.8581466674805
2014	100
2015	100
2021	98.1494293212891
2022	95.5545501708984
2023	91.5302886962891