Year	% (cumulative)
1971	53
2004	89.1661682128906
2005	88.9880065917969
2006	88.6137924194336
2007	90.2390975952148
2008	89.4680633544922
2009	89.443359375
2010	89.5227966308594
2011	89.4312515258789
2012	89.8591079711914
2013	89.4114608764648
2014	89.3653717041016
2015	89.4881210327148
2016	89.7140426635742
2017	89.6080474853516
2018	90.3683166503906
2019	90.0465545654297
2020	91.2177810668945
2021	91.2447204589844
2022	91.8595428466797