Year	% of total teachers
2002	40.5228805541992
2003	42.3841094970703
2004	35.3333282470703
2005	39.0728492736816
2007	40
2008	35.9477081298828
2009	50.3401412963867
2010	43.529411315918
2011	55.5045890808105
2012	52.8846206665039