76% (1985)

56% (1969)

77% (1988)

46% (1990)

57% (1971)

73% (1985)

59% (1975)

62% (1971)

71% (1983)

67% (1987)

70% (1969)

68% (1969)

45% (1986)

58% (1976)

69% (1986)

75% (1981)

54% (1982)

72% (1982)

53% (1989)

55% (1985)