Year	% of total secondary
1999	20.9602699279785
2000	20.7420806884766
2001	20.5534992218018
2002	20.1928997039795
2003	20.4224891662598
2004	20.6585502624512
2005	21.2514591217041
2006	21.7737197875977
2007	22.7194309234619
2008	23.1875305175781
2009	23.7887897491455
2010	24.5295295715332
2011	25.3628902435303
2012	26.0694103240967
2013	25.9443206787109
2014	27.6921691894531
2015	27.9816398620605
2016	28.5398902893066
2017	28.5051803588867
2018	29.0146198272705
2019	29.2581996917725
2020	29.3614196777344
2021	29.3882598876953
2022	29.29833984375