Year	% (cumulative)
1971	3.81022000312805
1981	5.44166994094849
2001	9.64612007141113
2005	10.2633199691772
2006	10.6048898696899
2007	10.9819297790527
2008	11.4477996826172
2009	11.5133600234985
2010	11.7644395828247
2011	11.8242597579956
2012	12.1516199111938
2013	12.8920125961304
2014	13.2121295928955
2015	13.4987602233887
2016	13.6098384857178
2017	14.1889085769653
2018	14.839259147644
2019	15.0374889373779
2020	15.2682800292969
2021	14.7445592880249
2022	14.874400138855