78% (1960)

71% (1980)

73% (1964)

63% (1960)

65% (1959)

55% (1981)

54% (1980)

65% (1963)

68% (1981)

49% (1964)

70% (1964)

30% (1965)

40% (1966)

60% (1965)

53% (1963)

57% (1960)

78% (1969)

56% (1960)

90% (1962)

52% (1964)