Year	% (cumulative)
1974	5.60659980773926
2001	20.4799995422363
2004	21.0900001525879
2005	21.4799995422363
2006	21.8713130950928
2007	20.7821006774902
2008	23.2574863433838
2009	23.4500007629395
2010	24.8600006103516
2011	25.4099998474121
2012	25.25
2013	27.1000003814697
2014	30.3099994659424
2015	31.1200008392334
2016	32.2799987792969
2017	30.7881088256836
2018	30.4699993133545
2019	33.939998626709