Year	% of total
1990	99.7599974829459
1995	99.7572707109522
2000	99.6653438640465
2005	99.6623330082442
2010	99.6595835775439
2011	99.9999999997725
2012	99.0999722700016
2013	96.612430187567
2014	76.4561885648068
2015	76.8574279806792
2016	63.8563596536228
2017	63.8101396946187