69% (1965)

76% (1977)

70% (1987)

52% (1957)

61% (1968)

67% (1985)

54% (1977)

61% (1988)

62% (1982)

69% (1944)

42% (1968)

58% (1968)

50% (1968)

20% (1977)

63% (1958)

68% (1989)

57% (1987)

69% (1976)

61% (1970)

63% (1979)