Year	% of total teachers
1998	68.1951293945312
1999	73.0043106079102
2000	74.2951202392578
2001	76.3183822631836
2002	77.6741561889648
2003	83.0779724121094
2004	87.9887313842773
2005	92.4560089111328
2007	95.8590087890625
2008	96.3399276733398
2009	95.7632293701172
2010	95.0710525512695
2011	94.9779968261719
2012	94.9181671142578
2013	95.0748901367188
2014	94.775520324707
2015	95.5945129394531
2016	95.3512420654297
2017	96.1521911621094
2018	96.4888687133789
2019	96.5358810424805
2020	97.1019515991211
2021	97.3652496337891
2022	97.5233612060547