Year	% of total teachers
2003	88.0040664672852
2004	70.32568359375
2006	48.4453086853027
2007	42.7645988464355
2010	42.8315696716309
2011	47.9867286682129
2012	57.1184310913086
2015	54.2466201782227
2017	67.3438186645508
2020	78.1029968261719
2021	73.4269638061523
2022	72.8195495605469