Year	% of total teachers
1998	46.7787094116211
1999	47.043701171875
2000	47.2019500732422
2001	56.5972213745117
2002	47.0588188171387
2003	49.6994018554688
2005	40.891471862793
2006	45.0081787109375
2009	37.8378410339355
2010	39.0029983520508
2011	49.5099983215332
2012	72.3820495605469
2013	71.5640029907227
2014	73.197380065918
2015	80.661003112793
2016	86.3079986572266
2017	87.129997253418
2018	88.7229995727539
2019	66.2200012207031