64% (1989)

71% (1981)

64% (1982)

38% (1987)

60% (1982)

62% (1986)

58% (1992)

70% (1983)

69% (1986)

75% (1992)

59% (1981)

54% (1992)

73% (1988)

72% (1991)

68% (1991)

60% (1987)

70% (1982)

57% (1983)

65% (1987)

57% (1988)