Year	% of total teachers
1998	99.1803283691406
2002	82.6267929077148
2003	92.0195388793945
2004	99.3059310913086
2005	98.7031402587891
2006	99.2209091186523
2007	99.4951782226562
2009	78.757682800293
2010	72.9652404785156
2011	74.2666702270508
2012	75.8639297485352
2013	76.3135375976562
2015	73.231689453125