Year	% (cumulative)
1970	2.94565
1976	5.43954
1980	5.78235
2004	7.53762
2006	8.10298
2007	8.42728
2008	9.09023
2009	9.50755
2010	9.97199
2011	10.10423
2012	10.51894
2013	11.10469
2014	11.41948
2015	11.86109
2016	13.5613
2017	13.68589
2018	14.54734