Year	% of total teachers
1998	75.3303985595703
1999	79.1970825195312
2000	76.3025207519531
2001	84.5642471313477
2002	83.0519104003906
2005	84.7121429443359
2006	96.2573089599609
2007	89.7236328125
2008	94.9400787353516
2009	95.5683975219727
2010	97.6337127685547
2011	98.3779983520508
2012	93.0970001220703
2013	98.9290008544922
2014	92.8059997558594
2015	93.2829971313477
2016	94.7229995727539
2017	96.463996887207
2018	98.1900024414062
2019	94.1028900146484