Year	% (cumulative)
1971	63.3450889587402
1981	71.6517333984375
2006	96.6936874389648
2008	96.916862487793
2009	96.9323272705078
2010	96.6154174804688
2011	96.8787689208984
2014	97.5193176269531
2015	97.7804489135742
2017	97.84912109375
2019	97.8223876953125
2022	97.8746871948242