Year	% of total
1990	99.5668379288967
1995	99.5655623010591
2000	99.2749105802208
2005	99.3472760291558
2010	99.4148599017614
2011	99.4278574083508
2012	99.4209353413294
2013	99.2502445322699
2014	98.540259483331
2015	99.4615767206659
2016	90.1808147205456
2017	91.5413027946999