68% (1974)

37% (1970)

63% (1964)

62% (1964)

47% (1968)

56% (1975)

64% (1976)

55% (1967)

61% (1965)

71% (1965)

56% (1972)

58% (1977)

65% (1963)

51% (1970)

64% (1977)

50% (1962)

66% (1969)

53% (1971)

48% (1960)

44% (1973)