Year	% of total teachers
2002	83.1735000610352
2003	84.0246429443359
2004	79.5061416625977
2005	77.7147674560547
2006	77.0430374145508
2007	76.5259475708008
2008	71.9183883666992
2009	68.0580062866211
2010	66.0157470703125
2011	70.4186935424805
2012	72.0893630981445
2013	71.991569519043
2014	73.4095993041992
2015	74.2528686523438
2016	78.0647201538086
2017	78.0988998413086
2018	76.1619491577148
2019	74.3120803833008
2020	74.9156723022461
2021	75.274658203125