Year	% (cumulative)
1971	22.623010635376
1976	24.6420307159424
1981	29.0906791687012
1991	38.9341697692871
1996	44.8213691711426
2006	56.2032585144043
2008	57.4016609191895
2009	58.0415802001953
2010	59.0415992736816
2011	61.3675117492676
2014	63.1904792785645
2015	64.2067337036133
2017	65.3535614013672
2019	66.0748825073242
2022	67.0348510742188