65% (1974)

55% (1967)

47% (1968)

37% (1970)

62% (1964)

60% (1966)

65% (1963)

42% (1958)

66% (1969)

51% (1970)

61% (1965)

55% (1961)

63% (1964)

64% (1969)

56% (1972)

64% (1977)

50% (1962)

73% (1961)

52% (1962)

54% (1977)