Year	% (cumulative)
1972	22.1188507080078
1981	37.7738914489746
1993	54.248218536377
2000	54.4000015258789
2001	53.810001373291
2002	56.0900001525879
2003	55.0299987792969
2004	57.2799987792969
2005	57.1100006103516
2006	58.5800018310547
2007	61.189998626709
2008	61.5800018310547
2009	62.3300018310547
2010	62.75
2011	61.9900016784668
2012	63.560001373291
2013	63.4900016784668
2014	63.7900009155273
2015	64.5400009155273
2016	64.9300003051758
2017	64.9899978637695
2018	66.2600021362305
2019	66.5500030517578
2020	67.1600036621094
2021	66.7200012207031
2022	67.9199981689453