Year % (cumulative) 1975 6.33633995056152 2003 34.4547996520996 2006 24.7390003204346 2008 23.2000007629395 2009 24.0799999237061 2010 24.7399997711182 2011 26.7199993133545 2012 27.1800003051758 2013 27.0200004577637 2014 27.8700008392334 2015 27.9300003051758 2016 28.0100002288818 2017 29.2000007629395 2018 29.5200004577637 2019 30.6900005340576 2021 33.5400009155273 2022 34.7900009155273