Year	% of total teachers
2001	56.2670288085938
2005	57.5342483520508
2006	57.0414199829102
2008	56.5883598327637
2009	58.0838317871094
2010	61.0190010070801
2011	65.0637893676758
2012	65.0438232421875
2013	68.838996887207
2014	71.0599975585938
2015	71.8479995727539
2017	72.7720031738281
2018	76.5410003662109
2019	73.7519989013672
2020	71.0630035400391
2022	72.6933822631836