Year	% of total secondary
1999	16.4009399414062
2002	15.8587198257446
2003	14.9131498336792
2004	11.5496101379395
2005	10.8774995803833
2006	10.3889598846436
2007	14.784839630127
2009	20.0058498382568
2012	19.3934803009033
2013	19.0604801177979
2014	18.6132106781006
2015	18.3648300170898
2016	15.7867202758789
2017	14.8158702850342