65% (1974)

37% (1970)

61% (1965)

64% (1977)

41% (1959)

63% (1964)

62% (1966)

67% (1968)

47% (1968)

42% (1958)

55% (1967)

65% (1972)

56% (1972)

54% (1961)

64% (1976)

56% (1975)

50% (1969)

65% (1963)

64% (1969)

49% (1979)