Year	% of total secondary
1999	29.991060256958
2000	27.1616706848145
2001	27.14501953125
2002	25.8300495147705
2003	25.0267105102539
2004	24.1333808898926
2005	24.6174297332764
2006	25.3469505310059
2007	26.2255592346191
2008	27.1082305908203
2009	28.2973709106445
2010	28.824779510498
2011	28.4371795654297
2012	28.299129486084
2013	30.5080108642578
2014	32.8079795837402
2015	33.3111305236816
2016	32.8003196716309
2017	31.1145095825195