71% (1988)

66% (1967)

48% (1960)

78% (1971)

62% (1983)

49% (1957)

50% (1982)

72% (1982)

60% (1986)

63% (1981)

74% (1983)

54% (1968)

73% (1965)

51% (1986)

50% (1956)

45% (1980)

55% (1971)

50% (1977)

64% (1970)

68% (1956)