72% (1981)

80% (1976)

71% (1967)

73% (1966)

81% (1979)

71% (1980)

69% (1985)

63% (1972)

79% (1971)

77% (1976)

64% (1982)

72% (1971)

69% (1984)

51% (1956)

69% (1986)

79% (1965)

66% (1966)

71% (1968)

60% (1981)

57% (1984)