Year	% of total secondary
1998	6.3344202041626
1999	6.31779003143311
2000	6.26933002471924
2001	6.06461000442505
2002	5.91103982925415
2003	5.84217977523804
2004	5.96312999725342
2005	6.37766981124878
2006	5.92171001434326
2007	5.9346399307251
2008	5.96138000488281
2009	6.27854013442993
2010	6.87587976455688
2011	7.31621980667114
2012	7.43755006790161
2013	7.70454978942871
2014	7.91351985931396
2015	8.12773990631104
2016	8.09978008270264
2017	8.23394012451172
2018	8.25975036621094
2019	8.3533296585083
2020	8.5244197845459
2021	8.43523979187012
2022	8.50491046905518