80% (1959)

66% (1969)

72% (1980)

69% (1975)

73% (1968)

71% (1968)

78% (1973)

69% (1971)

71% (1983)

63% (1967)

71% (1970)

76% (1962)

72% (1970)

68% (1982)

72% (1962)

71% (1979)

72% (1964)

71% (1981)

72% (1976)

78% (1969)