Year	% of total secondary
1998	18.4648990631104
1999	20.6544799804688
2000	18.382640838623
2001	18.3273601531982
2002	17.2733898162842
2003	17.3359394073486
2004	18.1506900787354
2005	18.7794799804688
2006	18.9114303588867
2007	18.5875205993652
2008	19.265100479126
2009	19.0801296234131
2010	19.1054496765137
2011	19.3438606262207
2012	19.7508506774902
2013	19.0529403686523
2014	19.3757305145264
2015	19.5138492584229
2016	19.3607406616211
2017	19.2612991333008
2018	19.2138404846191
2019	19.0562000274658
2020	18.9323196411133
2021	18.2457599639893
2022	18.3477096557617