Year	% (cumulative)
1970	81.9078521728516
1980	89.0083389282227
2001	91.5039901733398
2005	94.1225204467773
2009	98.3528289794922
2010	98.5293731689453
2011	98.6658172607422
2012	98.7211837768555
2013	98.8074569702148
2014	97.8921203613281
2015	97.9687881469727
2016	98.2306823730469
2017	98.3670654296875
2018	98.6229705810547
2019	98.7517623901367
2020	98.8295288085938
2021	98.9972076416016
2022	99.1145858764648