63% (1988)

73% (1981)

60% (1984)

55% (1987)

80% (1976)

69% (1985)

73% (1966)

72% (1971)

83% (1983)

45% (1983)

82% (1979)

76% (1980)

72% (1966)

71% (1967)

50% (1971)

64% (1972)

77% (1956)

60% (1984)

73% (1968)

37% (1969)