Year	% (cumulative)
1975	7.11627006530762
1992	14.8787298202515
2001	16.4798698425293
2006	16.7709808349609
2007	17.1444702148438
2008	17.5093898773193
2009	17.5846900939941
2010	17.4761695861816
2011	17.6929206848145
2012	18.1234703063965
2013	19.2977104187012
2014	20.1537303924561
2015	20.3896903991699
2016	20.5625095367432
2017	20.5775203704834
2018	21.0044002532959
2019	20.9701290130615
2020	22.1183204650879
2021	22.2995719909668
2022	22.1036491394043