Year	% of total teachers
2004	83.8200073242188
2005	84.1308212280273
2006	83.1271133422852
2007	81.4631271362305
2008	80.5000610351562
2011	78.3417434692383
2012	78.5036697387695
2013	80.1494293212891
2014	79.8356399536133
2015	79.9945526123047
2016	76.7592010498047
2017	76.7231674194336
2018	81.9294128417969
2019	81.1568222045898
2020	79.1314468383789
2021	78.2316436767578
2022	77.5555877685547