Year	% of total teachers
1998	36.2497100830078
1999	36.2883110046387
2000	36.8401298522949
2001	35.5098495483398
2002	37.0853996276855
2003	36.9597396850586
2004	37.612419128418
2007	44.5092582702637
2008	57.1440200805664
2009	57.4447898864746
2010	58.4889984130859
2011	59.6699981689453
2012	59.6559982299805
2013	59.6129989624023
2020	62.1679992675781
2021	66.9759979248047
2022	66.9670028686523