Year % (cumulative) 2006 0 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2014 18.0725288391113 2015 19.0651702880859 2016 19.3164005279541 2017 19.7957096099854 2018 19.9103164672852 2019 20.0103206634521 2020 20.5497341156006 2021 20.1942939758301 2022 20.3538093566895