56% (1979)

52% (1983)

52% (1946)

67% (1973)

57% (1988)

66% (1976)

56% (1976)

50% (1950)

58% (1975)

60% (1966)

60% (1971)

71% (1974)

68% (1953)

66% (1959)

59% (1958)

73% (1964)

65% (1976)

71% (1937)

63% (1984)

64% (1988)