Year	% of total
1971	99.98000840435269
1972	99.97646694822069
1973	99.97967609783295
1974	99.98796502691188
1975	99.98889258882502
1976	99.97870716180928
1977	99.98705526582545
1978	99.98427331318844
1979	99.9868951273883
1980	99.99527016520531
1981	99.989564706196
1982	99.98293021171138
1983	99.98439363594466
1984	99.98229057942845
1985	99.99360346079298
1986	99.98078161372851
1987	99.98392817417835
1988	99.98595955633343
1989	99.98052376148809
1990	99.97888612418045
1991	99.98186196879763
1992	99.98948220591642
1993	99.99263450994553
1994	99.98474926845283
1995	99.98764354658898
1996	99.99535366872128
1997	99.99551493725282
1998	99.99512132030887
1999	99.99520675716029
2000	99.99541575410946
2001	99.99480235044066
2002	99.99530971186898
2003	99.99536304728167
2004	99.9956219627523
2005	99.99571843134846
2006	99.99559705800704
2007	99.9957383515465
2008	99.99617989451653
2009	99.99641029183374
2010	99.99677609064287
2011	99.20369243658553
2012	99.51085197144072
2013	99.57056249726367
2014	99.9280186217461