Year	% (cumulative)
1970	9.40937995910645
1981	20.4192295074463
1986	24.6000003814697
1991	34.1586990356445
2004	59.2617301940918
2005	62.5247802734375
2006	63.8490104675293
2007	64.736328125
2008	65.6189880371094
2009	66.458381652832
2010	67.3895492553711
2011	68.7965087890625
2012	69.8730163574219
2013	71.9855270385742
2014	73.7143478393555
2015	74.8149490356445
2016	75.7975234985352
2017	77.5248794555664
2018	77.7223587036133
2019	79.844352722168
2020	80.7694320678711
2021	82.8143692016602
2022	83.2263412475586