Year	% of total
1990	99.99999999996868
1995	99.99999999997208
2000	99.999999999999
2005	99.99999999999912
2010	99.99999999999922
2011	99.99999999999923
2012	99.99999999999913
2013	99.99999690942535
2014	99.99992055568258
2015	99.99982837740482
2016	99.99765526906984
2017	99.99767718050471