68% (1966)

42% (1969)

64% (1968)

68% (1960)

56% (1960)

69% (1964)

61% (1960)

62% (1969)

71% (1962)

63% (1969)

68% (1962)

47% (1971)

72% (1975)

77% (1959)

50% (1971)

60% (1961)

72% (1948)

66% (1963)

30% (1963)

64% (1963)