57% (1980)

74% (1982)

56% (1996)

45% (1986)

54% (1980)

73% (1979)

58% (1998)

52% (1996)

60% (1991)

52% (1989)

75% (1993)

75% (1985)

50% (1993)

77% (1982)

57% (1991)

58% (1991)

59% (1984)

72% (1994)

69% (2000)

62% (1983)