70% (1987)

76% (1977)

69% (1976)

69% (1985)

62% (1974)

62% (1958)

69% (1969)

63% (1967)

70% (1965)

64% (1987)

74% (1983)

62% (1988)

42% (1968)

48% (1956)

60% (1979)

45% (1959)

59% (1987)

56% (1987)

65% (1930)

32% (1960)