Year	% (cumulative)
1974	12.4131898880005
2001	45.8699989318848
2004	45.0999984741211
2005	45.6399993896484
2006	47.5543365478516
2007	45.6967391967773
2008	50.3439712524414
2009	50.4000015258789
2010	50.9300003051758
2011	52.6300010681152
2012	52.9900016784668
2013	54.5200004577637
2014	58.3600006103516
2015	59.0699996948242
2016	60.939998626709
2017	58.3634643554688
2018	59.2900009155273
2019	61.9000015258789