Year	% of total teachers
1999	43.9623184204102
2000	48.0667495727539
2001	53.7912788391113
2002	53.8005218505859
2003	84.2398681640625
2004	84.237907409668
2005	92.204948425293
2006	66.930419921875
2007	79.6707763671875
2008	78.8636779785156
2009	84.7704620361328
2010	82.6346664428711
2011	82.6314315795898
2012	78.2865600585938
2013	81.8139266967773
2014	81.3526077270508
2015	82.8784332275391
2016	87.8933181762695
2017	92.3952407836914
2018	88.2031478881836
2019	85.1470565795898
2021	80.5704727172852