Year	% of total
1990	99.99999999968162
1995	99.99999999972205
2000	99.99999999956638
2005	99.99999999962883
2010	99.99999999966504
2011	99.99999999966977
2012	99.99999999966928
2013	99.99999999964935
2014	99.97624111745961
2015	99.9754677039702
2016	99.60587764504588
2017	99.3300796302866