Year	% of total teachers
2004	64.0896072387695
2005	88.2685165405273
2006	88.3104705810547
2007	88.2698822021484
2008	88.814567565918
2009	72.2677764892578
2010	85.0202102661133
2011	85.1218490600586
2012	85.2389526367188
2013	81.2682800292969
2014	81.2848815917969
2015	88.1076889038086
2021	100