Year	% of total teachers
1999	56.4530296325684
2000	60.6157493591309
2001	61.9557189941406
2002	49.660961151123
2003	48.0756492614746
2004	50.0246391296387
2005	51.1005897521973
2006	48.9254989624023
2007	50.0098991394043
2009	64.1211929321289
2010	66.7862167358398
2011	71.1162414550781
2012	77.3894424438477
2013	83.2115707397461