Year	% (cumulative)
1971	19.1239604949951
2004	70.5769882202148
2005	70.8846817016602
2006	69.9333801269531
2007	72.4459915161133
2008	71.0071029663086
2009	70.8537216186523
2010	71.4568328857422
2011	70.4048690795898
2012	71.1873397827148
2013	73.9762496948242
2014	73.7489013671875
2015	73.8232727050781
2016	73.8941116333008
2017	74.0601272583008
2018	74.7519683837891
2019	74.5371704101562
2020	76.2264785766602
2021	76.2296981811523
2022	75.7747955322266