Year	% (cumulative)
1970	5.78318023681641
1975	8.2089900970459
1980	11.6052303314209
1985	13.1369304656982
1988	16.7617092132568
2005	11.3403301239014
2006	10.8670902252197
2007	10.6414003372192
2008	10.8191499710083
2012	14.3610095977783
2013	11.6331996917725
2015	12.1416397094727
2017	13.8277597427368
2018	14.9694299697876