Year	% (cumulative)
1970	1.97546005249023
1976	4.30000019073486
1980	4.97579002380371
2004	8.11464023590088
2006	8.64058971405029
2007	9.3326997756958
2008	10.0150604248047
2009	10.5968704223633
2010	11.2994003295898
2011	11.4495601654053
2012	11.9615001678467
2013	12.6315698623657
2014	13.1573696136475
2015	13.5562496185303
2016	15.3451795578003
2017	15.734580039978
2018	16.5433902740479