Year	% of total
1960	54.0983606557377
1961	41.25
1962	41.66666666666667
1963	43.33333333333334
1964	29.06976744186046
1965	22.340425531914896
1966	27.358490566037734
1967	28.947368421052627
1968	18.91891891891892
1969	19.819819819819823
1970	20.192307692307693
1971	15.625000000000004
1972	3.3112582781456954
1973	7.236842105263158
1974	3.9473684210526314
1975	0
1976	5
1977	0
1978	1.8691588785046727
1979	1.282051282051282
1980	0.6493506493506493
1981	0.6944444444444444
1982	0.7092198581560283
1983	1.01010101010101
1984	0.6451612903225806
1985	0
1986	0
1987	0
1988	0
1989	0