Year	% of total teachers
2000	87.3081970214844
2001	87.7514877319336
2002	89.8409729003906
2003	89.6797332763672
2005	88.0905075073242
2006	88.9018096923828
2007	86.8634719848633
2008	84.5224685668945
2009	85.1117782592773
2010	82.1689376831055
2011	82.3956680297852
2012	81.4983825683594
2013	80.820442199707
2014	77.4373321533203
2015	76.4938888549805
2016	76.006706237793
2017	74.0685577392578
2018	72.9361572265625