Year	% of total teachers
1999	71.7963714599609
2000	69.09326171875
2001	68.6124114990234
2002	64.9443817138672
2003	62.1085510253906
2004	67.9608383178711
2005	57.8754005432129
2006	61.4824600219727
2007	53.0111999511719
2008	49.0710792541504
2009	47.5666885375977
2010	50.6026191711426
2011	50.6002807617188
2012	52.2658805847168
2013	53.3044204711914
2014	52.3977584838867
2015	54.6945190429688
2016	56.0447692871094
2017	55.373779296875
2018	60.4105491638184
2019	61.5381011962891
2020	67.3241271972656
2021	65.5213317871094