Year	% (cumulative)
1980	8.06346988677979
1990	12.1197004318237
2000	11.0166397094727
2004	14.9794101715088
2005	13.7441596984863
2006	17.7718391418457
2007	17.3344993591309
2008	17.0933094024658
2009	18.0833396911621
2010	15.3998098373413
2012	18.5739593505859
2013	16.2209205627441
2014	15.6446199417114
2015	17.2598705291748
2016	16.463550567627
2017	17.358699798584
2018	17.7133598327637
2020	19.3074398040771