Year	% of total teachers
1999	37.7483406066895
2000	49.1615905761719
2001	49.6731986999512
2002	29.8888206481934
2003	31.4126396179199
2004	28.2463207244873
2005	28.9097595214844
2006	28.462459564209
2007	36.7635192871094
2008	41.951789855957
2009	54.4451103210449
2010	60.5706481933594
2011	69.1394729614258
2012	81.5102081298828
2013	85.7362365722656