Year	% (cumulative)
1973	16.9106006622314
2001	36.5434188842773
2002	37.4099998474121
2003	38.5299987792969
2004	38.7299995422363
2005	39.8499984741211
2006	40.1199989318848
2007	41.4900016784668
2008	42.2200012207031
2009	42.6300010681152
2010	41.439998626709
2011	42.8400001525879
2012	43.6599998474121
2013	44.9700012207031
2014	46.3199996948242
2015	44.5
2016	44.4700012207031
2017	45.6800003051758
2018	46.060001373291
2019	47.4300003051758
2020	47.1599998474121
2021	49.2000007629395
2022	50.1399993896484