Year	% (cumulative)
1971	32.0589485168457
1981	47.6378784179688
1991	61.4764289855957
2006	83.8780136108398
2007	81.8735275268555
2008	78.8329620361328
2009	79.6415176391602
2010	81.0681991577148
2011	83.4697036743164
2012	82.4836044311523
2013	83.6273803710938
2014	86.3575592041016
2015	86.670166015625
2016	86.8106002807617
2017	86.1611022949219
2018	87.6276321411133
2019	87.6477355957031
2020	88.5820541381836
2021	89.8500366210938
2022	90.1428375244141