76% (1965)

47% (1988)

73% (1974)

56% (1964)

79% (1973)

80% (1987)

58% (1979)

48% (1979)

78% (1972)

40% (1962)

50% (1982)

40% (1976)

79% (1961)

60% (1978)

40% (1951)

80% (1953)

54% (1974)

41% (1981)

54% (1979)

54% (1952)