Year	% of total teachers
2003	92.1930999755859
2004	91.5531692504883
2005	90.9165802001953
2006	90.2832870483398
2007	89.6669387817383
2008	87.7892379760742
2009	92.7722396850586
2011	92.4232711791992
2015	93.7401504516602
2016	95.2562103271484
2017	93.8241729736328
2018	95.0815734863281