Year	% of total teachers
1999	72.5944290161133
2000	75.9591979980469
2002	79.6206283569336
2004	79.4365692138672
2005	82.445426940918
2006	74.4312515258789
2007	82.4451065063477
2008	83.0934066772461
2009	92.9653625488281
2010	93.3194808959961
2011	76.0079574584961
2012	92.8639907836914
2013	73.1853866577148
2015	79.3786926269531
2021	100