Year	% of total secondary
1999	20.6647701263428
2000	20.4642295837402
2001	20.2015800476074
2002	19.9486694335938
2003	20.1407794952393
2004	20.3534202575684
2005	20.9233303070068
2006	21.4045104980469
2007	22.3051795959473
2008	22.7304992675781
2009	23.2733306884766
2010	23.9444198608398
2011	24.6771106719971
2012	25.3114891052246
2013	25.2389297485352
2014	26.9083309173584
2015	27.1751499176025
2016	27.7123508453369
2017	27.690860748291
2018	28.1631698608398
2019	28.3940505981445
2020	28.4859600067139
2021	28.5057506561279
2022	28.4161491394043