Year	% (cumulative)
1971	5.69554996490479
1981	9.26860046386719
1991	14.4300003051758
2006	39.4660606384277
2007	43.3893508911133
2008	39.0004386901855
2009	41.9927978515625
2010	42.9250183105469
2011	37.2884902954102
2012	46.441780090332
2013	47.6978950500488
2014	49.7154960632324
2015	49.6673583984375
2016	49.9390258789062
2017	41.9473304748535
2018	52.0992279052734
2019	52.5815391540527
2020	54.7341728210449
2021	56.9747886657715
2022	57.7087020874023