Year	% of total
1960	100
1961	94.73684210526315
1962	100
1963	100
1964	100
1965	100
1966	100
1967	100
1968	93.33333333333333
1969	93.75000000000001
1970	100
1971	100
1972	100
1973	94.73684210526315
1974	95
1975	100
1976	100
1977	100
1978	100
1979	98.76543209876544
1980	100
1981	99.39024390243902
1982	100
1983	99.47368421052632
1984	99.42196531791909
1985	99.4047619047619
1986	99.38650306748465
1987	94.04761904761904
1988	95.78947368421052
1989	94.68085106382979
1990	95.90615384615384
1991	94.40574468085107
1992	93.96687499999999
1993	94.73083333333334
1994	98.84956521739132
1995	99.41644444444445
1996	96.45804347826086
1997	94.73083333333334
1998	95.49479166666667
1999	95.342
2000	93.79057692307693
2001	93.08538461538461
2002	92.38019230769231
2003	92.03450980392157
2004	91.675
2005	93.47254901960784
2006	93.47254901960784
2007	93.03314814814814
2008	92.71283018867923
2009	93.63946428571428
2010	94.57
2011	94.21369230769231
2012	95.2401388888889
2013	95.43602564102564
2014	95.07037037037037
2015	91.47784946236558
2016	82.07095238095238