Year	% (cumulative)
1970	99.4000015258789
1975	98.1999969482422
1980	98.1474533081055
1990	99.8041076660156
2006	99.6076278686523
2007	100
2008	100
2009	100
2010	100
2011	100
2012	99.9310302734375
2013	99.9536590576172
2014	99.6536331176758
2015	99.6657333374023
2016	99.6748504638672
2017	99.6854019165039
2018	99.449821472168
2019	99.7143783569336
2020	99.1379623413086
2021	91.4885406494141
2022	97.7384033203125