Year	% (cumulative)
1972	1.14923000335693
1982	2.50559997558594
1992	7.33889007568359
2003	8.84570026397705
2005	5.46121978759766
2006	4.61830997467041
2007	9.49794960021973
2008	11.7141199111938
2009	9.27635955810547
2012	12.2399396896362
2013	15.2960300445557
2014	14.9341697692871
2015	16.5902404785156
2016	16.0942707061768
2018	17.212329864502
2019	18.6598796844482
2020	17.9371795654297