Year	% of total teachers
1999	63.8211402893066
2000	66.8312835693359
2001	71.0743789672852
2002	75.037712097168
2003	77.8421401977539
2004	62.8164596557617
2005	60.4599418640137
2006	57.132869720459
2014	53.6160011291504
2015	52.3037490844727
2016	54.8947792053223
2017	47.4020118713379
2018	48.8542594909668
2019	51.9230804443359
2020	52.1922416687012
2021	51.315788269043
2022	50.6043510437012