Year	% of total teachers
2002	100
2005	89.5145568847656
2006	89.0118026733398
2007	85.2702713012695
2008	86.5702514648438
2009	82.5242691040039
2010	89.0020370483398
2011	80.5734786987305
2012	86.3854293823242
2013	77.549186706543
2014	81.0457534790039
2015	82.5531921386719
2016	83.3333282470703
2017	82.5531921386719
2018	80.9832992553711
2019	85.1817321777344
2021	88.6233291625977