Year	% (cumulative)
1974	15.4828701019287
1982	24.6395206451416
1990	37.9841499328613
2001	42.060001373291
2003	41.5699996948242
2005	42.8499984741211
2006	43.2999992370605
2007	43.5800018310547
2008	43.560001373291
2009	43.4900016784668
2010	45.0299987792969
2011	45.8899993896484
2012	47.2700004577637
2013	48.2900009155273
2014	49.4700012207031
2015	52.2799987792969
2016	51.9500007629395
2017	53.2200012207031
2018	51.0200004577637
2019	51.7799987792969
2020	52.0200004577637
2021	54.0499992370605
2022	54.2700004577637