Year	% of total
1990	99.9999999997722
1995	99.9999999997459
2000	100
2005	100
2010	100
2011	100
2012	99.9999999999627
2013	99.8704497249189
2014	99.8344140530631
2015	99.8116826887052
2016	99.5957983323731
2017	99.5981414813269