Year	% of total teachers
1999	57.6981887817383
2000	64.9971771240234
2003	77.9996032714844
2004	72.1768417358398
2009	40.3982200622559
2010	42.631031036377
2011	46.8895606994629
2014	67.59375
2015	69.09716796875
2016	70.4166107177734
2017	68.2663497924805
2018	70.4254608154297
2019	71.2228927612305
2020	76.9972991943359
2021	75.0768890380859