Year	% of total teachers
1999	71.4515686035156
2000	76.0773162841797
2001	78.1464462280273
2002	79.9583892822266
2003	83.300537109375
2004	81.0052337646484
2007	88.5570907592773
2008	86.5888824462891
2009	87.9951705932617
2020	81.7180023193359
2022	79.2943725585938