77% (1976)

76% (1978)

57% (1974)

80% (1973)

52% (1968)

73% (1981)

50% (1968)

52% (1973)

71% (1983)

50% (1970)

59% (1969)

55% (1967)

68% (1967)

45% (1969)

46% (1975)

40% (1973)

50% (1972)

57% (1983)

67% (1970)

55% (1968)