Year	% (cumulative)
1970	6.74449014663696
1981	16.788890838623
1986	20.8999996185303
1991	30.4210090637207
2004	55.7412300109863
2005	59.0312881469727
2006	60.3833885192871
2007	61.3471183776855
2008	62.3463592529297
2009	63.2927398681641
2010	64.2052383422852
2011	65.6445388793945
2012	66.7898712158203
2013	69.2204895019531
2014	70.8926162719727
2015	72.1667709350586
2016	73.3104400634766
2017	75.3778457641602
2018	75.370002746582
2019	77.7738647460938
2020	78.5347290039062
2021	81.084228515625
2022	81.5416717529297