Year % (cumulative) 2006 0.237566441297531 2007 0.229060113430023 2008 0.248933896422386 2009 0.242893218994141 2010 0.243718653917313 2011 0.22661991417408 2012 0.292419701814651 2013 0.312971711158752 2014 14.2597093582153 2015 15.3868761062622 2016 16.0571804046631 2017 16.9888916015625 2018 18.0253562927246 2019 18.0067329406738 2020 18.9136714935303 2021 18.9514045715332 2022 19.0439777374268