Year	% of total
1990	99.2413637543748
1995	99.2581553659895
2000	99.9999999989484
2005	99.9999999992861
2010	99.999999999308
2011	99.9999999997054
2012	96.7394235499816
2013	89.1673867118382
2014	63.3432072102478
2015	59.3249570979358
2016	20.2410395932432
2017	20.2380298927069