Year	% (cumulative)
1981	18.2069492340088
2001	37.2355499267578
2005	42.4920196533203
2006	43.3208808898926
2007	44.6541595458984
2008	45.3787002563477
2009	46.3311882019043
2010	47.0301094055176
2011	47.4161605834961
2012	48.3647308349609
2013	49.1950416564941
2014	49.8125495910645
2015	50.1708984375
2016	50.7747764587402
2017	51.6649131774902
2018	52.6355781555176
2019	52.9375686645508
2020	53.2030601501465
2021	52.6157875061035
2022	52.7747840881348