Year	% of total
1990	99.99996694287424
1995	99.99996633621036
2000	99.99928808019352
2005	99.99936391763698
2010	99.99942552437275
2011	99.99943710771527
2012	99.99944868223706
2013	99.99946020345256
2014	99.99937691097047
2015	99.99937082439781
2016	99.9988987416002
2017	99.99895095930027