Year	% of total teachers
2002	88.7965621948242
2003	84.2447509765625
2004	77.597282409668
2005	76.4091720581055
2006	76.3903884887695
2007	78.4136962890625
2008	78.8050079345703
2009	78.0918884277344
2010	76.3661880493164
2011	74.1623992919922
2012	78.5434265136719
2013	74.1673736572266
2014	72.7485275268555
2015	73.6167221069336
2016	73.8414688110352
2017	72.8974609375
2018	72.2724075317383
2019	73.3275833129883
2020	73.5932312011719