Year	% of total
1990	99.9999999981167
1995	99.9999999983783
2000	99.999999999712
2005	99.999999999758
2010	99.9999999997965
2011	99.9999999998436
2012	99.9999999997792
2013	99.9999999997354
2014	99.9999999996518
2015	99.9799860248742
2016	99.7170666602465
2017	99.6887933668832