Year	% of total teachers
2007	85.6425476074219
2008	83.7157135009766
2009	83.2649078369141
2010	81.4609680175781
2011	81.0018997192383
2012	79.8130416870117
2013	78.9049987792969
2014	78.283203125
2015	78.2796401977539
2016	76.637939453125
2017	75.8256225585938
2018	74.950813293457
2019	74.6766967773438
2020	73.1024703979492
2021	74.3414688110352
2022	72.1123962402344