Year	% of total secondary
1999	11.811900138855
2000	12.3965196609497
2001	13.5839700698853
2002	14.2156496047974
2003	14.6670703887939
2004	15.1480798721313
2005	15.0374402999878
2006	15.5403604507446
2007	15.6716203689575
2008	15.9788703918457
2009	15.9369897842407
2010	16.0754699707031
2011	16.3285102844238
2012	16.638219833374
2013	16.8093395233154
2014	16.5390205383301
2015	16.6410007476807
2016	17.5749206542969
2017	17.5513000488281
2018	17.3200397491455
2019	16.8923892974854
2020	17.0124702453613
2021	18.567310333252