Year	% of total secondary
1999	0.127660006284714
2000	0.29135000705719
2001	1.35093998908997
2002	1.64452004432678
2003	2.21758008003235
2004	2.85209989547729
2005	3.65749001502991
2009	6.78567981719971
2010	7.20479011535645
2019	9.47157001495361