Year	% of total teachers
2006	87.1123733520508
2007	86.5411911010742
2008	83.0658187866211
2009	83.1448287963867
2010	82.0913009643555
2011	80.7713317871094
2012	82.1446075439453
2013	79.7851409912109
2014	79.935417175293
2015	81.2399978637695
2016	82.2160873413086
2017	83.5612411499023
2018	83.3662719726562
2019	78.5086975097656
2020	78.6946716308594
2021	79.8777770996094
2022	78.8469009399414