Year	% (cumulative)
1970	99.4000015258789
1975	98.4000015258789
1980	98.3753280639648
1990	99.8121109008789
2006	99.5545654296875
2007	100
2008	100
2009	100
2010	100
2011	100
2012	99.9394454956055
2013	99.9606170654297
2014	99.5800704956055
2015	99.5945434570312
2016	99.6048736572266
2017	99.6143188476562
2018	99.3063735961914
2019	99.6461868286133
2020	99.0529022216797
2021	87.2023010253906
2022	96.5161056518555