Year	% (cumulative)
1973	34.161548614502
2001	73.2964935302734
2002	73.5199966430664
2003	75.3000030517578
2004	75.5999984741211
2005	77.370002746582
2006	76.5400009155273
2007	77.120002746582
2008	78.4000015258789
2009	78.5100021362305
2010	78.9199981689453
2011	79.6100006103516
2012	79.9499969482422
2013	80.7900009155273
2014	80.75
2015	81.120002746582
2016	80.8399963378906
2017	81.4599990844727
2018	81.9499969482422
2019	82.8099975585938
2020	82.879997253418
2021	83.75
2022	83.7799987792969