Year	% of total teachers
2004	89.1530075073242
2005	85.6250991821289
2006	84.4618606567383
2007	84.4323120117188
2008	83.1960678100586
2012	87.45458984375
2013	82.9917831420898
2014	80.6821212768555
2015	77.191780090332
2016	75.0618896484375
2017	74.628288269043
2018	73.4668426513672
2019	72.2242126464844
2020	70.686393737793
2021	68.9001388549805
2022	75.2569122314453