Year	% (cumulative)
1970	60.2000007629395
1972	63.4605102539062
1976	67.5
1981	74.2655181884766
1986	78.8717269897461
1990	83.0933456420898
1991	83.6178283691406
1992	84.472282409668
1993	85.4048309326172
1994	85.1307983398438
1995	85.633056640625
1996	86.1088714599609
1997	86.8316497802734
1998	87.4687423706055
1999	87.893424987793
2000	88.4019088745117
2001	89.2443237304688
2002	89.569206237793
2003	89.9677505493164
2004	90.3515243530273
2005	90.7728652954102
2006	91.0965347290039
2007	91.5776596069336
2008	92.0232772827148
2009	92.4541397094727
2010	92.8302536010742
2011	93.145133972168
2012	93.5289535522461
2013	93.7035903930664
2014	93.9242706298828
2015	94.2533645629883
2016	94.4660949707031
2017	94.8020858764648
2018	95.1618194580078
2019	95.113395690918
2020	95.5116195678711
2021	95.9441070556641
2022	96.1069641113281
2023	96.3000946044922