Year	% (cumulative)
1970	21.6000003814697
1980	31.4991798400879
1990	44.0075492858887
1997	52.6518173217773
2000	52.1399993896484
2001	48.4000015258789
2002	49.8800010681152
2003	51.0900001525879
2004	52.1100006103516
2005	52.5299987792969
2006	53.2299995422363
2007	54.4599990844727
2008	56.0800018310547
2009	56.4700012207031
2010	61.490291595459
2011	57.6399993896484
2013	60.0900001525879
2014	60.9500007629395
2015	61.7000007629395
2016	62.4799995422363
2017	62.6699981689453
2018	62.7200012207031
2019	64.3899993896484
2021	66.6399993896484
2022	66.5699996948242
2023	66.5643920898438