57% (1970)

82% (1962)

70% (1967)

68% (1967)

55% (1970)

78% (1966)

74% (1963)

68% (1971)

56% (1969)

72% (1970)

65% (1970)

56% (1960)

56% (1968)

51% (1970)

51% (1965)

56% (1966)

63% (1963)

60% (1969)

63% (1964)

67% (1964)