Year	% (cumulative)
1972	27.5532493591309
1981	44.2566413879395
2000	51
2001	52.7700004577637
2002	54.560001373291
2003	52.1100006103516
2004	54.9500007629395
2005	55.5499992370605
2006	57.3300018310547
2007	59.6500015258789
2008	59.8400001525879
2009	59.8300018310547
2010	60.25
2011	60.5200004577637
2012	62.0800018310547
2013	62.1300010681152
2014	63.0900001525879
2015	64.9199981689453
2016	64.6900024414062
2017	65.1800003051758
2018	65.6900024414062
2019	67.0899963378906
2020	68.5800018310547
2021	68.7799987792969
2022	70.1500015258789