Year	% of total
1960	100
1961	100
1962	100
1963	100
1964	90.3225806451613
1965	75.45454545454545
1966	72.65625
1967	84.21052631578947
1968	74.6268656716418
1969	95.09536784741144
1970	95.625
1971	77.94117647058823
1972	65.62500000000001
1973	68.57142857142857
1974	64.99999999999999
1975	64.99999999999999
1976	64.99999999999999
1977	64.99999999999999
1978	92.85714285714285
1979	100
1980	100
1981	100
1982	100
1983	100
1984	100
1985	100
1986	100
1987	100
1988	100
1989	100
1990	100.11492063492065
1991	100.41938461538462
1992	99.9597037037037
1993	100.44391304347826
1994	97.0382993197279
1995	99.32470198675497
1996	94.2942857142857
1997	86.28235294117647
1998	96.77855670103092
1999	99.25858638743456
2000	100.84249999999999
2001	104.7226976744186
2002	99.88841628959277
2003	99.99508403361344
2004	102.76844537815126
2005	105.14844696969696
2006	101.6815593220339
2007	95.03641666666667
2008	89.16208121827411
2009	88.3801268498943
2010	95.17802845528456
2011	90.72115606936416
2012	90.52483394833948
2013	87.27197132616487
2014	75.88422322775263
2015	64.79221445221445
2016	65.00590909090909