72% (1981)

52% (1987)

71% (1967)

80% (1976)

56% (1982)

70% (1966)

62% (1988)

82% (1979)

66% (1966)

69% (1985)

73% (1966)

78% (1956)

63% (1972)

74% (1968)

64% (1982)

79% (1971)

62% (1969)

51% (1956)

73% (1965)

57% (1984)