77% (1976)

76% (1978)

79% (1973)

50% (1968)

57% (1974)

68% (1967)

71% (1983)

73% (1981)

55% (1967)

67% (1970)

50% (1970)

55% (1975)

58% (1967)

53% (1974)

52% (1968)

51% (1969)

52% (1973)

55% (1968)

40% (1973)

57% (1983)