Year	% of total
1990	99.8552180058423
1995	99.8010994012019
2000	99.0824692033599
2005	98.4440445653184
2010	99.878414659033
2011	99.9837076837724
2012	100
2013	99.9796669849281
2014	100
2015	100
2016	100
2017	100