Year	% of total teachers
1999	86.190071105957
2000	86.3181381225586
2001	90.8401489257812
2002	91.1931381225586
2005	94.58984375
2006	97.4655914306641
2007	97.9888610839844
2008	98.2002105712891
2009	97.0823135375977
2010	99.0643768310547
2011	99.234748840332
2012	99.0770034790039
2014	100
2015	99.5770034790039
2016	99.4899978637695
2017	98.9789962768555
2018	99.0179977416992
2019	99.5640029907227
2020	99.8860015869141
2021	83.2740020751953
2022	86.2649993896484