Year	% of total secondary
1999	0.750329971313477
2000	1.1808500289917
2006	4.55756998062134
2010	5.71779012680054
2011	5.42209005355835
2012	5.08360004425049
2013	4.92312002182007
2014	5.58483982086182
2015	5.55078983306885
2016	5.33475017547607
2017	4.7778902053833
2018	4.69180011749268
2019	4.67052984237671
2020	4.7248101234436