61% (1988)

70% (1987)

76% (1977)

71% (1983)

27% (1986)

61% (1970)

32% (1946)

32% (1960)

63% (1930)

52% (1957)

30% (1928)

69% (1944)

67% (1985)

60% (1968)

63% (1958)

48% (1956)

57% (1987)

68% (1989)

62% (1982)

69% (1965)