Year	% (cumulative)
1975	23.4143505096436
1985	38.8991088867188
1996	43.6236991882324
2003	60.2359390258789
2006	48.4956016540527
2008	47.6300010681152
2009	50.0800018310547
2010	51.4500007629395
2011	54.1800003051758
2012	54.4500007629395
2013	53.75
2014	55.1100006103516
2015	55.8400001525879
2016	56.7200012207031
2017	57.689998626709
2018	58.5699996948242
2019	59.5
2021	62.5299987792969
2022	64.620002746582