Year	% of total teachers
2003	69.307487487793
2004	66.4324111938477
2005	64.5531768798828
2006	65.6517105102539
2007	66.4672164916992
2008	62.5261306762695
2009	59.3805198669434
2010	61.0928993225098
2011	63.0520286560059
2012	64.8953094482422
2013	65.2547225952148
2014	63.8903198242188
2015	63.9176902770996
2016	63.1473503112793
2017	64.1268081665039
2018	63.2715797424316
2019	65.4582672119141
2020	66.0126724243164
2021	66.9746017456055