Year	% of total
1990	99.9810706530859
1995	99.9892858536742
2000	99.9858101216086
2005	99.9990192438351
2010	99.9997174919515
2011	99.9970926667125
2012	99.9987848993188
2013	99.9745398507742
2014	99.6352008949127
2015	99.3891695178291
2016	98.6523483664329
2017	98.3156239365569