Year	% of total teachers
2002	97.9037780761719
2003	97.7423629760742
2004	98.5277786254883
2005	99.7972183227539
2006	99.6296081542969
2007	99.8100662231445
2008	99.7715530395508
2009	99.8662033081055
2010	99.7615814208984
2011	99.8773498535156
2012	99.6439895629883
2013	99.6285095214844
2014	99.4370727539062
2015	99.3871688842773
2016	99.4728622436523
2017	99.6488418579102
2018	99.5548782348633
2019	99.515022277832
2020	99.4790267944336
2021	99.3466720581055
2022	99.3698425292969