Year	% of total
1971	100
1972	100
1974	99.99932905268949
1975	100
1976	100
1977	99.99986572819628
1978	99.99981999625592
1979	100
1980	100
1981	100
1984	100
1985	99.99999999999997
1987	100
1988	100
1991	99.99996575259779
1993	99.99999999999999
1996	100
1997	99.99999999999999
1998	99.99995583657235
1999	100
2000	99.99999999999999
2001	100
2002	100
2003	98.13631877004781
2004	99.01366105328174
2007	100
2008	99.99999361163601
2009	99.99999367757744
2010	99.99999465767304
2011	100
2013	100
2014	99.96316865185302