78% (1960)

72% (1980)

54% (1980)

65% (1959)

68% (1981)

73% (1964)

40% (1966)

63% (1960)

65% (1963)

30% (1965)

70% (1964)

56% (1960)

49% (1964)

55% (1981)

79% (1969)

53% (1963)

57% (1960)

90% (1962)

60% (1965)

52% (1964)