Year	% (cumulative)
1971	47.0055389404297
2001	85.888298034668
2010	81.7339859008789
2011	82.9287796020508
2013	83.4952163696289
2014	84.4765472412109
2015	84.6151657104492
2016	84.6792907714844
2017	85.4794082641602
2018	85.8745498657227
2019	86.647575378418
2020	86.7269897460938