Year	% of total teachers
2002	40.3703689575195
2003	39.4736785888672
2004	35.4243507385254
2005	39.0243911743164
2007	39.730640411377
2008	35.6060600280762
2009	49.6598587036133
2010	49.1525382995605
2011	55.5999984741211
2012	53.3333282470703