85% (1966)

81% (1965)

64% (1976)

69% (1972)

63% (1968)

79% (1976)

70% (1971)

65% (1974)

67% (1969)

70% (1972)

55% (1965)

62% (1972)

63% (1968)

73% (1967)

70% (1968)

63% (1969)

67% (1972)

63% (1970)

68% (1976)

68% (1969)