72% (1981)

71% (1967)

82% (1979)

81% (1976)

69% (1985)

78% (1956)

73% (1966)

63% (1972)

57% (1984)

60% (1984)

63% (1974)

62% (1988)

52% (1987)

61% (1992)

45% (1983)

74% (1968)

70% (1968)

66% (1984)

73% (1965)

56% (1982)