Year % (cumulative) 2009 11.3939304351807 2010 14.3332347869873 2011 15.3649444580078 2012 15.2349796295166 2013 16.2316761016846 2014 15.7185497283936 2015 16.1495990753174 2018 16.9144706726074 2019 17.3798694610596