Year	% (cumulative)
1970	1.01814
1976	3.2
1980	4.13623
2004	8.6289
2006	9.1212
2007	10.14061
2008	10.83581
2009	11.56658
2010	12.51466
2011	12.64609
2012	13.24935
2013	13.993
2014	14.70135
2015	15.061
2016	16.91928
2017	17.54056
2018	18.29206