Year % (cumulative) 2001 20.3565502166748 2007 19.2934608459473 2009 20.5618896484375 2010 21.076099395752 2011 24.4233798980713 2012 23.3566970825195 2013 24.1895084381104 2015 27.3100204467773 2016 24.1347694396973 2017 24.3800601959229 2018 24.2692451477051 2019 27.4885902404785 2020 24.2097206115723 2021 28.5798759460449