Year	% of total teachers
1999	97.508903503418
2000	97.5891036987305
2001	95.8300476074219
2002	96.4049301147461
2003	98.1410217285156
2004	96.7524719238281
2005	90.6299209594727
2006	94.8520736694336
2007	93.1151428222656
2008	89.5015716552734
2009	99.3332595825195
2010	99.3487777709961
2011	99.4077606201172
2012	99.4762725830078
2013	99.5969161987305
2014	99.6306076049805
2015	99.3391799926758
2016	97.1787109375
2017	95.8460006713867
2019	97.911003112793
2020	99.4619979858398
2021	99.6569976806641
2022	93.6740036010742