Year	% (cumulative)
1971	16.3642902374268
1976	19.2999992370605
1981	24.4849300384521
1991	36.162540435791
1996	43.079719543457
2006	54.1144485473633
2008	55.2869300842285
2009	55.9717102050781
2010	57.0574493408203
2011	59.1782684326172
2014	61.2203788757324
2015	62.1582908630371
2017	63.267520904541
2019	63.9573402404785
2022	65.0502777099609