48% (1971)

63% (1997)

59% (1976)

65% (1969)

69% (1954)

57% (1972)

63% (1969)

44% (1971)

68% (1968)

74% (1951)

67% (1976)

61% (1976)

56% (1972)

62% (1979)

58% (1966)

67% (1979)

53% (1967)

67% (1964)

58% (1982)

52% (1967)