Year	% of total
1990	99.9999930813135
1995	99.99957767839766
2000	99.99934908263282
2005	99.99953959938412
2010	99.99985650398224
2011	99.99967930766864
2012	99.99940225630716
2013	99.9886725009434
2014	99.95882135680448
2015	99.9765589485089
2016	99.6353831433084
2017	99.4415233583321