Year	% of total secondary
1997	15.1331195831299
1998	15.180100440979
1999	15.1535596847534
2000	15.1103601455688
2001	15.0030698776245
2002	15.0361299514771
2003	15.0353498458862
2004	15.1641397476196
2005	15.2471599578857
2006	15.0688400268555
2007	15.2891302108765
2008	15.5508899688721
2009	15.8769397735596
2010	16.2150897979736
2011	16.2226505279541
2012	16.688850402832
2013	19.27659034729
2014	19.5612297058105
2015	19.6739501953125
2016	19.9753494262695
2017	20.2154998779297
2018	20.3918704986572
2019	20.3640003204346
2020	20.2728996276855
2021	20.638219833374
2022	20.5916595458984