Year	% of total teachers
2002	86.8692398071289
2003	82.6538619995117
2004	88.5766906738281
2005	84.3932189941406
2006	76.5483169555664
2007	74.4658279418945
2008	63.1378593444824
2009	59.2569999694824
2010	55.6886291503906
2011	46.1412582397461
2012	55.719841003418
2013	48.4287796020508
2014	55.8428382873535
2015	57.6186103820801
2016	61.0271797180176
2017	62.0653114318848
2018	62.9483795166016
2019	61.382209777832