Year	% (cumulative)
1971	21.5
2001	59.2889213562012
2002	60.4455299377441
2003	61.1234703063965
2004	64.1210021972656
2005	65.0338516235352
2006	66.7138366699219
2007	68.1897811889648
2008	70.0889587402344
2009	70.8557434082031
2010	72.7989730834961
2011	74.0616683959961
2012	76.4830169677734
2013	72.037353515625
2014	73.5959625244141
2015	75.5475769042969
2016	76.4180374145508
2017	77.261360168457
2018	78.3257598876953
2019	79.0479278564453
2020	80.0530319213867
2021	81.1301116943359
2022	81.6710815429688