Year % of total secondary 2008 0.394899994134903 2009 0.43163999915123 2010 0.559000015258789 2011 0.505879998207092 2012 0.420749992132187 2013 0.45184999704361 2014 0.466740012168884 2015 0.488550007343292 2016 0.471329987049103 2017 0.464199990034103 2018 0.460920006036758 2019 0.459729999303818 2020 0.495460003614426 2021 0.591949999332428 2022 0.651750028133392