Year	% of total teachers
2003	71.8070526123047
2004	73.2645416259766
2005	75.9329528808594
2006	77.8613662719727
2007	79.0949172973633
2008	80.4789810180664
2009	87.7007369995117
2010	76.2556991577148
2011	76.9879989624023
2012	77.6330032348633
2013	84.2735214233398
2015	81.5039978027344
2016	75.4019012451172
2017	74.7675476074219