78% (1976)

79% (1973)

76% (1978)

57% (1974)

67% (1970)

50% (1970)

52% (1968)

38% (1969)

57% (1983)

73% (1981)

55% (1968)

52% (1973)

45% (1969)

50% (1968)

55% (1975)

50% (1972)

68% (1967)

49% (1970)

58% (1967)

51% (1969)