Year	% of total teachers
1999	77.5700912475586
2000	73.2548370361328
2001	74.6436614990234
2002	68.9413299560547
2003	67.2857131958008
2004	76.8849792480469
2005	81.7004470825195
2006	78.9628829956055
2007	62.7572784423828
2009	78.2722473144531
2010	75.1555099487305
2011	73.7446212768555
2012	72.3194427490234
2013	80.0065002441406