Year	% (cumulative)
1971	69.030891418457
2001	92.0568084716797
2005	92.2394104003906
2006	92.5596771240234
2007	92.7186813354492
2008	93.1019134521484
2009	93.4180908203125
2010	93.6998672485352
2011	93.97998046875
2012	94.3895492553711
2013	94.9674911499023
2014	95.0038299560547
2015	95.2694625854492
2016	95.9965362548828
2017	96.3192672729492
2018	96.6481552124023
2019	96.8862533569336
2020	96.7274398803711
2021	97.5451812744141
2022	97.6554489135742