Year	% (cumulative)
1973	11.323390007019
2001	28.5734710693359
2002	28.7299995422363
2003	29.6900005340576
2004	29.8899993896484
2005	30.5300006866455
2006	30.4400005340576
2007	31.8899993896484
2008	32.2799987792969
2009	33.2200012207031
2010	33.2900009155273
2011	33.9900016784668
2012	34.9300003051758
2013	35.9700012207031
2014	37.25
2015	34.8199996948242
2016	35.1399993896484
2017	35.5900001525879
2018	36.0800018310547
2019	37.4700012207031
2020	37.4700012207031
2021	38.4099998474121
2022	39.4199981689453