48% (1983)

45% (1985)

69% (1986)

68% (1980)

42% (1984)

71% (1982)

50% (1962)

41% (1985)

65% (1983)

31% (1985)

74% (1974)

73% (1981)

75% (1986)

58% (1958)

62% (1976)

70% (1979)

69% (1985)

70% (1974)

55% (1960)

69% (1988)