Year	% of total secondary
1999	1.19895994663239
2001	1.31912004947662
2003	1.65374994277954
2004	1.67826998233795
2005	2.18112993240356
2010	3.46754002571106
2011	4.06612014770508
2013	4.45250988006592
2016	3.85234999656677