Year	% of total
1990	99.9998875726277
1995	99.9998756208876
2000	99.9998956459776
2005	99.9997309507628
2010	99.9998949553216
2011	99.9998954007077
2012	99.9976780527439
2013	99.9976852786275
2014	99.9972881363634
2015	99.9977024729053
2016	99.9971540926079
2017	99.9971668819229