Year	% (cumulative)
1971	1.31235003471375
1981	5.45895004272461
1990	11.2708396911621
2001	20.3610000610352
2005	19.3063468933105
2006	14.5976600646973
2007	15.9020900726318
2008	16.9595394134521
2009	18.4559993743896
2010	27.468729019165
2011	28.9362297058105
2012	30.3820152282715
2015	34.767650604248
2016	38.7368507385254
2017	34.9420051574707