Year	% of total secondary
1998	29.8671092987061
1999	31.9431705474854
2000	31.7651405334473
2001	31.6880798339844
2004	32.1452598571777
2005	32.4739685058594
2011	32.5038986206055
2012	33.0190887451172
2014	33.827220916748
2015	32.4536399841309
2016	30.9043292999268