Year	% of total teachers
2002	65.160758972168
2003	63.3302803039551
2004	63.9953918457031
2005	60.9934005737305
2006	61.4486694335938
2007	58.5974311828613
2008	55.751220703125
2009	55.1204109191895
2010	58.2586212158203
2011	58.2516288757324
2012	57.8692398071289
2013	59.6039505004883