Year	% of total
1990	99.9999863043925
1995	99.9991799428266
2000	99.99907368094837
2005	99.99914913930346
2010	99.99974339858936
2011	99.99974741709175
2012	99.99914818927634
2013	99.99892800603074
2014	99.96541901981995
2015	99.9686981756384
2016	99.54630852904482
2017	99.23992902016641