Year	% (cumulative)
1971	25.3655605316162
1976	29.2000007629395
1981	37.6579704284668
1986	46
1991	53.9734916687012
1996	61.7018890380859
2006	71.2339630126953
2008	72.2553863525391
2009	73.1078567504883
2010	73.9628677368164
2011	75.3992385864258
2014	77.4559020996094
2015	78.4135131835938
2017	79.4001693725586
2019	79.8697662353516
2022	80.6186065673828