Year	% of total teachers
1999	59.576171875
2000	62.7018508911133
2001	60.429328918457
2002	72.484619140625
2003	73.665283203125
2004	76.3926315307617
2006	98.2713088989258
2007	99.0000534057617
2008	98.9996109008789
2009	98.8698501586914
2010	99.8601837158203
2014	99.5479888916016
2018	95.3369369506836