Year	% of total teachers
1998	18.8419094085693
1999	20.5509796142578
2000	22.4078102111816
2001	20.8274002075195
2002	21.3068695068359
2003	25.2542591094971
2004	25.6294593811035
2007	32.9551391601562
2008	42.0010681152344
2009	41.7185096740723
2010	40.6939010620117
2011	46.8079986572266
2012	52.0839996337891
2013	56.1870002746582
2016	58.5439987182617
2020	61.326000213623
2021	60.8370018005371
2022	62.4959983825684