Year	% of total secondary
2007	5.88582992553711
2008	5.96468019485474
2009	6.36758995056152
2016	4.22819995880127
2017	4.97959995269775
2018	5.16589021682739
2019	5.31209993362427
2020	5.42978000640869
2021	5.62062978744507