Year	% (cumulative)
1973	16.4445209503174
2001	36.3465003967285
2002	37.5999984741211
2003	38.8300018310547
2004	38.8800010681152
2005	39.9300003051758
2006	40.5999984741211
2007	41.4099998474121
2008	42.5299987792969
2009	42.8300018310547
2010	42.0299987792969
2011	43.2799987792969
2012	44.189998626709
2013	44.9000015258789
2014	46.5900001525879
2015	45.4799995422363
2016	45.4199981689453
2017	46.5299987792969
2018	47.189998626709
2019	48.0999984741211
2020	48.189998626709
2021	50.189998626709
2022	51.2799987792969