Year	% of total teachers
2000	54.0864105224609
2001	40.8976287841797
2003	40.985050201416
2004	51.4461784362793
2006	39.3763885498047
2007	45.4585494995117
2008	42.7577209472656
2009	42.5376281738281
2010	45.2048988342285
2011	47.5115013122559
2012	54.3443298339844
2013	48.7762985229492
2014	60.7496795654297
2015	67.5039215087891
2016	72.8448333740234
2017	75.0070037841797
2018	79.2283706665039
2019	82.2722091674805
2020	86.0662002563477
2021	87.0052032470703
2022	88.1410293579102