Year	% of total teachers
1998	59.2849998474121
1999	66.1354598999023
2001	71.7131500244141
2002	69.2087707519531
2003	73.1385498046875
2004	72.2003936767578
2007	77.5991363525391
2008	82.9694290161133
2009	79.6359481811523
2010	84.1037216186523
2011	89.0110015869141
2012	85.2907562255859
2013	82.6966323852539
2014	76.051399230957
2015	84.2809371948242
2017	66.5193405151367
2018	61.0686988830566
2019	84.640998840332
2020	82.9219970703125
2021	82.0380020141602
2022	79.0120010375977