Year	% of total secondary
1999	16.3686008453369
2000	16.7566299438477
2001	15.9116201400757
2002	16.8232402801514
2003	16.9927196502686
2004	16.8236293792725
2005	17.2018699645996
2006	17.3538303375244
2007	18.0142002105713
2008	18.1215190887451
2009	19.4375896453857
2010	19.7754592895508
2011	20.167049407959
2012	19.1974697113037
2013	19.4050998687744
2014	20.4103603363037
2015	20.6589908599854
2016	20.4636001586914
2017	21.0615501403809
2018	21.4766101837158
2019	21.8395099639893
2020	22.3699607849121
2021	22.4482707977295
2022	22.6793308258057