Year	% (cumulative)
1972	13.8929395675659
1981	27.6347904205322
1993	42.5531806945801
2000	42.5499992370605
2001	43.2000007629395
2002	44.689998626709
2003	43.7400016784668
2004	45.8800010681152
2005	46.6100006103516
2006	47.439998626709
2007	49.4900016784668
2008	50.2200012207031
2009	50.3600006103516
2010	50.2000007629395
2011	50.4099998474121
2012	52.3400001525879
2013	51.689998626709
2014	52.0699996948242
2015	53.3699989318848
2016	53.3400001525879
2017	53.9599990844727
2018	54.3199996948242
2019	55.4500007629395
2020	55.9599990844727
2021	55.560001373291
2022	57.0200004577637