Year	% of total secondary
1998	12.1624002456665
1999	12.3127698898315
2000	12.191780090332
2001	11.3528299331665
2002	12.294750213623
2003	12.0030603408813
2004	11.96875
2005	12.2516603469849
2006	12.2120304107666
2007	12.8715801239014
2008	13.10315990448
2009	14.6628799438477
2010	15.1536502838135
2011	15.5553102493286
2012	14.509880065918
2013	15.1938495635986
2014	16.3354396820068
2015	16.5162200927734
2016	16.1243095397949
2017	16.7212390899658
2018	17.1229400634766
2019	17.6421394348145
2020	18.131929397583
2021	18.3747501373291
2022	18.4298801422119