78% (1976)

80% (1967)

69% (1973)

57% (1974)

75% (1978)

55% (1975)

71% (1969)

78% (1973)

54% (1962)

46% (1962)

53% (1965)

50% (1965)

59% (1977)

54% (1974)

62% (1964)

51% (1968)

40% (1974)

49% (1976)

52% (1975)

53% (1962)