69% (1973)

63% (1966)

74% (1978)

50% (1963)

55% (1968)

53% (1968)

50% (1975)

50% (1972)

68% (1967)

40% (1974)

50% (1970)

59% (1977)

49% (1967)

45% (1969)

52% (1961)

75% (1978)

41% (1976)

54% (1962)

45% (1973)

45% (1962)