69% (1970)

74% (1965)

69% (1977)

66% (1965)

70% (1968)

60% (1960)

63% (1975)

67% (1971)

63% (1970)

50% (1960)

56% (1965)

50% (1959)

30% (1964)

57% (1965)

63% (1960)

36% (1963)

40% (1959)

67% (1972)

50% (1961)

54% (1967)