Year	% of total teachers
2005	91.3376312255859
2006	87.0480422973633
2007	86.6987915039062
2008	81.0617980957031
2009	79.3721008300781
2010	76.6216201782227
2011	67.1556396484375
2012	76.6475219726562
2013	68.4907379150391
2014	71.8489990234375
2015	72.1029281616211
2016	78.122428894043
2017	78.3860626220703
2018	77.4681930541992
2019	76.0055313110352