Year	% (cumulative)
1971	16.3761596679688
1981	28
2001	59.2840690612793
2005	63.4613800048828
2006	64.7704772949219
2007	65.8625564575195
2008	66.9809112548828
2009	68.0265808105469
2010	69.1159820556641
2011	70.2331237792969
2012	71.2490081787109
2013	73.0408706665039
2014	73.427116394043
2015	74.3441162109375
2016	76.3918685913086
2017	77.4028244018555
2018	78.5290451049805
2019	79.4889144897461
2020	78.6272583007812
2021	79.2322387695312
2022	79.7553558349609