Year	% of total
1990	99.9999999989308
1995	99.9999999989595
2000	100
2005	100
2010	100
2011	100
2012	99.999999999993
2013	99.999999999993
2014	99.8181262460333
2015	99.8185107661135
2016	99.5631292580941
2017	99.5653335783953