Year	% (cumulative)
1972	3.40000009536743
1981	1.89251005649567
2005	3.91673994064331
2006	6.29511976242065
2007	5.36543083190918
2008	6.07085990905762
2009	6.67146015167236
2010	6.97446012496948
2011	7.39944982528687
2012	7.54163980484009
2013	7.9913501739502
2014	8.75331020355225
2015	8.06536197662354
2016	16.1812782287598
2017	8.65032958984375
2018	3.17432999610901
2019	4.14662981033325
2021	8.62528419494629