Year	% of total teachers
2009	97.5842895507812
2010	97.0489196777344
2011	96.1539001464844
2012	94.9619903564453
2013	95.6655807495117
2014	94.9065780639648
2015	93.9885635375977
2016	93.8510894775391
2017	93.6670837402344
2018	93.8589630126953
2019	93.8760986328125