58% (1982)

73% (1975)

80% (1980)

50% (1981)

54% (1978)

82% (1981)

75% (1983)

69% (1981)

73% (1980)

61% (1977)

58% (1982)

65% (1986)

38% (1983)

64% (1987)

62% (1980)

71% (1977)

56% (1989)

68% (1981)

64% (1981)

68% (1986)