Year	% of total
1990	99.9999999993361
1995	99.9999999993935
2000	100
2005	100
2010	100
2011	100
2012	100
2013	99.999999999966
2014	99.9785717266658
2015	99.9785982241453
2016	99.9138839065148
2017	99.9134426224712