Year	% of total
1972	100
1975	100
1976	100
1977	99.999604109345
1978	100
1979	99.99964834051892
1980	100
1981	100
1984	99.99975708462686
1985	100
1986	100
1988	100
1989	100
1990	100
1991	99.99999999999997
1992	100
1995	100
1996	100
1997	100
1998	99.9998552304514
1999	100
2002	99.9674076094368
2003	99.96233325501234
2004	99.95104033263631
2005	99.94039644876365
2006	99.92246629204043
2007	99.91016083263122
2008	99.89146247147602
2009	99.88027152157939
2010	99.67246958175133
2011	99.23845357507422
2012	99.03840897287546
2013	98.75759658797983
2014	97.78846166266452