Year	% of total secondary
1997	14.6332502365112
1998	14.5329999923706
1999	14.4653797149658
2000	14.3837099075317
2001	14.2584400177002
2002	14.2785301208496
2003	14.2214603424072
2004	14.4645299911499
2005	14.5808401107788
2006	14.2703399658203
2007	14.3837995529175
2008	14.5834999084473
2009	14.8835601806641
2010	15.140700340271
2011	15.113320350647
2012	15.5873203277588
2013	18.2115592956543
2014	18.5030994415283
2015	18.7039794921875
2016	19.0148506164551
2017	19.2575397491455
2018	19.4869995117188
2019	19.4270896911621
2020	19.2961597442627
2021	19.6719207763672
2022	19.6105003356934