71% (1963)

78% (1964)

75% (1963)

73% (1964)

66% (1965)

75% (1970)

73% (1975)

56% (1972)

78% (1967)

63% (1965)

61% (1973)

64% (1973)

61% (1970)

54% (1974)

57% (1971)

58% (1965)

54% (1971)

63% (1967)

59% (1967)

61% (1963)