Year	% of total
1990	100
1995	100
2000	99.9682934495296
2005	99.9977749633908
2010	100
2011	99.9980645157405
2012	99.9920484896956
2013	99.9720326384961
2014	99.814127747777
2015	99.2398085650571
2016	98.5958069455546
2017	98.5933442878201