Year	% of total secondary
1998	19.3681106567383
1999	18.9430904388428
2000	18.5729007720947
2001	18.560230255127
2002	18.9837608337402
2003	19.2875194549561
2004	19.656909942627
2005	18.5959396362305
2006	17.8381099700928
2007	16.8800201416016
2008	16.2085208892822
2009	16.4064598083496
2010	16.3689708709717
2011	17.1571807861328
2012	16.8247509002686
2013	17.1477508544922
2014	17.433910369873
2015	17.2769794464111
2016	17.6400508880615
2017	17.6838703155518
2018	17.9243602752686
2019	18.1822700500488
2020	18.3047790527344
2021	18.3078899383545
2022	18.5002899169922