Year	% of total secondary
1997	16.0638904571533
1998	15.9238700866699
1999	15.3099203109741
2000	14.8234701156616
2001	14.9783000946045
2002	15.51060962677
2003	16.0794792175293
2004	16.3345203399658
2005	16.2802791595459
2006	16.6092395782471
2007	16.4237098693848
2008	16.7376194000244
2009	16.981819152832
2010	17.2360897064209
2011	18.443790435791
2012	17.9116897583008
2013	18.4084091186523
2014	18.7843494415283
2015	18.8309497833252
2016	19.0298099517822
2017	19.0142002105713
2018	19.2702007293701
2019	19.4601497650146
2020	19.4975204467773
2021	19.5710601806641
2022	19.6501693725586