Year	% of total
1990	99.99997955182091
1995	99.99877329576621
2000	99.9986083707764
2005	99.99872097215204
2010	99.99961355102627
2011	99.99961942836973
2012	99.9987167041697
2013	99.99838529827379
2014	99.94793501949574
2015	99.95292049885694
2016	99.32361677654488
2017	98.87351110927281