Year	% (cumulative)
1971	47.5
2004	87.381217956543
2005	87.0141296386719
2006	86.7947235107422
2007	88.6590728759766
2008	87.7878570556641
2009	87.892448425293
2010	87.7544021606445
2011	87.8881530761719
2012	88.3685302734375
2013	87.5810317993164
2014	87.3436965942383
2015	87.5252227783203
2016	87.9122695922852
2017	88.1957702636719
2018	89.016960144043
2019	88.7693786621094
2020	89.8081893920898
2021	90.0527572631836
2022	91.0731430053711