Year	% (cumulative)
1971	16.2428493499756
1976	20.5
1981	29.2764091491699
1986	38.5
1991	47.8853912353516
1996	56.7842292785645
2006	67.4015197753906
2008	68.7223968505859
2009	69.7459564208984
2010	70.7860794067383
2011	72.2372207641602
2014	74.6617584228516
2015	75.6529312133789
2017	76.5852737426758
2019	77.1004333496094
2022	77.8669128417969