Year	% (cumulative)
1974	6.38525009155273
2001	20.3799991607666
2004	20.1299991607666
2005	20.5100002288818
2006	21.2103176116943
2007	19.9335193634033
2008	22.4431247711182
2009	22.5499992370605
2010	23.8500003814697
2011	24.7700004577637
2012	24.0200004577637
2013	25.6599998474121
2014	29.3799991607666
2015	29.5300006866455
2016	31.2700004577637
2017	28.5961723327637
2018	29.1100006103516
2019	32.5099983215332