78% (1963)

58% (1970)

57% (1974)

70% (1967)

61% (1972)

59% (1972)

68% (1976)

51% (1969)

67% (1972)

62% (1976)

64% (1959)

80% (1954)

44% (1954)

69% (1961)

0% (1957)

48% (1971)

0% (1958)

57% (1979)

50% (1965)

53% (1956)