74% (1965)

70% (1977)

66% (1965)

71% (1968)

69% (1970)

68% (1971)

61% (1960)

54% (1967)

57% (1965)

47% (1960)

63% (1970)

50% (1961)

58% (1965)

63% (1975)

58% (1962)

50% (1960)

44% (1967)

63% (1960)

60% (1969)

30% (1964)