Year	% of total secondary
1998	6.04410982131958
1999	6.02174997329712
2000	5.96169996261597
2001	5.74069023132324
2002	5.56885004043579
2003	5.48777008056641
2004	5.58816003799438
2005	5.99066019058228
2006	5.50549983978271
2007	5.50243997573853
2008	5.52536010742188
2009	5.84849977493286
2010	6.45965003967285
2011	6.93332004547119
2012	7.03773021697998
2013	7.27402019500732
2014	7.45984983444214
2015	7.66008996963501
2016	7.61815977096558
2017	7.73767995834351
2018	7.76180982589722
2019	7.86080980300903
2020	8.03394031524658
2021	7.94240999221802
2022	8.01457977294922