Year	% of total secondary
1998	11.61559009552
1999	11.0149297714233
2000	10.6563701629639
2001	11.3745698928833
2002	11.2426300048828
2003	12.1957902908325
2004	12.9319095611572
2005	12.7858800888062
2006	12.8947200775146
2007	12.8170099258423
2008	12.8859996795654
2009	13.2525596618652
2010	13.5231103897095
2012	14.8045701980591
2013	15.6210098266602
2014	16.8132400512695
2015	15.9643602371216
2016	15.6989603042603
2017	15.4686899185181
2018	15.5243997573853
2019	16.5233497619629
2020	17.2882308959961