Year	% (cumulative)
1970	1.97546
1976	4.3
1980	4.94505
2004	8.11464
2006	8.64059
2007	9.3327
2008	10.01506
2009	10.59687
2010	11.2994
2011	11.44956
2012	11.9615
2013	12.63157
2014	13.15737
2015	13.55625
2016	15.34518
2017	15.73458
2018	16.54339