Year	% of total teachers
2004	90.3299331665039
2005	87.6188507080078
2006	87.3984069824219
2007	88.1272888183594
2008	87.4158096313477
2012	89.6886596679688
2013	87.1495971679688
2014	85.5268630981445
2015	82.5168533325195
2016	81.5565338134766
2017	81.2957305908203
2018	79.90869140625
2019	79.0581893920898
2020	78.3622131347656
2021	76.3479309082031
2022	80.8083877563477