Year	% (cumulative)
1970	4.59999990463257
1975	6.59999990463257
1980	10.0923595428467
1985	12.6556797027588
1988	16.3858604431152
2005	13.5123500823975
2006	13.1482496261597
2007	12.8202295303345
2008	13.1752195358276
2012	16.498649597168
2013	13.7716903686523
2015	15.0222702026367
2017	17.39208984375
2018	18.50705909729