Year	% of total
1973	99.99999999999996
1974	100
1976	99.99999999999993
1977	99.99995972010306
1979	99.9999669033956
1980	99.99999999999996
1981	99.99996777674698
1983	100
1984	99.99999999999999
1985	99.99997596985081
1986	100
1988	99.99999999999997
1989	99.9999797176288
1990	99.82209057047547
1992	99.9178525452305
1994	99.97064929306366
1995	99.99998445024866
1996	99.9420577148714
1998	99.93882340518276
2001	99.9544940041026
2003	99.05888345691739
2007	97.83177194894165
2009	99.78244842964345
2011	98.78594550787999
2014	99.36584717412737