Year % (cumulative) 2001 19.4977493286133 2007 18.7104301452637 2009 20.3277282714844 2010 20.8772239685059 2011 24.0842208862305 2012 23.2137985229492 2013 24.2208194732666 2015 26.9566192626953 2016 23.6137008666992 2017 24.0384407043457 2018 24.8970355987549 2019 27.9621963500977 2020 23.8363704681396 2021 29.2583923339844