Year	% of total secondary
1997	15.5848503112793
1998	15.6041498184204
1999	15.5036401748657
2000	15.4408597946167
2001	15.2044897079468
2002	15.0881004333496
2003	15.0014295578003
2004	15.1078300476074
2005	15.2236099243164
2006	14.9705896377563
2007	15.0896301269531
2008	15.3036603927612
2009	15.2163696289062
2010	15.3661003112793
2011	15.2361602783203
2012	15.6104001998901
2013	17.4059600830078
2014	17.6402893066406
2015	17.7314491271973
2016	18.1783790588379
2017	18.3092193603516
2018	18.5419292449951
2019	18.4866008758545
2020	18.3299999237061
2021	18.4286994934082
2022	18.4075698852539