Year	% of total teachers
2004	89.7347564697266
2005	89.1944580078125
2006	89.5485687255859
2007	90.2161331176758
2008	89.0046997070312
2009	88.667839050293
2012	87.9949798583984
2013	85.7032318115234
2014	84.6864776611328
2015	83.3234634399414
2016	82.6847686767578
2017	83.743293762207
2018	83.8525085449219
2019	83.8309783935547
2020	82.9758911132812
2021	81.1952133178711
2022	86.1819305419922