Year	% (cumulative)
1972	6.1449
1981	12.82003
1993	23.15614
2004	13.29265
2005	17.02532
2006	17.97847
2007	19.47168
2008	19.28094
2009	19.76344
2010	21.85272
2011	21.57835
2012	22.59164
2013	22.13121
2014	21.35431
2015	20.91365
2018	22.69314