78% (1973)

80% (1959)

73% (1968)

76% (1962)

72% (1964)

71% (1981)

77% (1969)

63% (1967)

73% (1962)

68% (1975)

66% (1969)

70% (1979)

71% (1968)

73% (1980)

72% (1970)

69% (1971)

71% (1970)

71% (1976)

71% (1977)

68% (1957)