Year	% of total
1990	99.9999999995859
1995	99.9999999994829
2000	99.9999999999611
2005	99.999999999963
2010	99.9999999999652
2011	99.9999999999771
2012	99.9999999999662
2013	99.9999999999555
2014	99.9999999999233
2015	99.9999999999459
2016	99.9999999998609
2017	99.9999999998623