Year	% (cumulative)
1970	61.5999984741211
1972	64.6600570678711
1976	67.9000015258789
1981	74.2506484985352
1986	79.2134475708008
1990	82.7900695800781
1991	83.3464584350586
1992	84.0816497802734
1993	85.101318359375
1994	84.7497940063477
1995	85.0795059204102
1996	85.6327667236328
1997	86.1390228271484
1998	86.8938522338867
1999	87.3911666870117
2000	87.8803024291992
2001	88.6841888427734
2002	89.0565032958984
2003	89.3918914794922
2004	89.7512435913086
2005	90.2203598022461
2006	90.4908676147461
2007	91.0618743896484
2008	91.4816818237305
2009	92.0101089477539
2010	92.5331649780273
2011	92.8317565917969
2012	93.0813674926758
2013	93.3555145263672
2014	93.6479110717773
2015	93.8281555175781
2016	94.2608032226562
2017	94.6484985351562
2018	94.9135131835938
2019	94.8671493530273
2020	95.2390670776367
2021	95.6152420043945
2022	95.9839477539062
2023	96.0787582397461