Year	% of total teachers
1999	59.4956283569336
2000	52.4711112976074
2001	54.6756210327148
2002	50.8236312866211
2003	54.2753105163574
2004	53.1681213378906
2005	50.425350189209
2006	50.9957809448242
2007	56.9539794921875
2008	55.9649810791016
2009	54.3611602783203
2010	55.7042007446289
2011	55.1190795898438
2012	55.3909492492676
2013	55.8463706970215
2014	55.2085494995117
2015	57.4005012512207
2016	55.9445610046387
2017	56.7027015686035
2018	57.0793991088867
2019	60.0142707824707
2020	61.9637718200684
2021	62.946949005127