Year	% of total teachers
1999	15.0003299713135
2001	15.3710203170776
2002	14.6815099716187
2003	16.2272090911865
2004	17.386079788208
2005	30.5144691467285
2007	61.3603096008301
2008	66.4361572265625
2010	73.6608963012695
2011	99.9520034790039
2012	92.5589981079102
2013	90.9079971313477
2014	93.5670013427734
2015	97.3550033569336
2016	95.6800003051758
2017	97.2785186767578
2019	97.2910614013672
2020	97.2210083007812
2021	97.2210006713867
2023	98.0970001220703