65% (1974)

47% (1968)

65% (1963)

61% (1965)

55% (1967)

37% (1970)

51% (1970)

54% (1977)

48% (1960)

50% (1962)

62% (1964)

63% (1964)

41% (1959)

42% (1958)

64% (1976)

62% (1966)

64% (1977)

56% (1972)

67% (1968)

53% (1971)