70% (1965)

69% (1970)

70% (1968)

72% (1971)

72% (1969)

53% (1964)

67% (1971)

66% (1974)

69% (1954)

56% (1970)

57% (1960)

63% (1954)

68% (1977)

56% (1961)

69% (1968)

56% (1968)

54% (1967)

64% (1954)

57% (1965)

62% (1960)