Year	% of total
1990	100
1995	100
2000	99.987691472824
2005	99.9884977300728
2010	99.989260556772
2011	100
2012	99.9895556175446
2013	99.8554663552376
2014	99.752917675971
2015	99.8595227514632
2016	99.1166530150884
2017	99.1456703252509