Year	% (cumulative)
1970	38.4417381286621
1981	14.0274295806885
1991	22.4267292022705
1998	77.1364593505859
1999	77.2610397338867
2000	78.5581817626953
2001	79.371711730957
2002	80.4671173095703
2003	81.5432510375977
2004	83.3864364624023
2005	84.2229995727539
2006	84.9868927001953
2007	85.5472106933594
2008	86.276237487793
2009	87.4093322753906
2010	87.9329833984375
2011	87.5851974487305
2012	88.4950714111328
2013	89.2771072387695
2014	89.9500198364258
2015	90.5410003662109
2016	91.117431640625
2017	91.7393112182617
2018	91.5428009033203
2019	92.8314971923828
2020	93.9047470092773
2021	95.6820297241211
2022	95.7251892089844