Year	% (cumulative)
1972	14.331859588623
1981	24.7324409484863
2000	46.8600006103516
2001	46.2599983215332
2002	48.5699996948242
2003	48.1399993896484
2004	50.5499992370605
2005	50.3199996948242
2006	52.1800003051758
2007	54.2599983215332
2008	54.8699989318848
2009	55.5400009155273
2010	56.1300010681152
2011	55.439998626709
2012	57.0900001525879
2013	56.9000015258789
2014	57.5200004577637
2015	57.9900016784668
2016	58.4300003051758
2017	58.75
2018	59.9799995422363
2019	60.5900001525879
2020	60.9000015258789
2021	60.5
2022	61.9500007629395