69% (1984)

73% (1985)

58% (1991)

61% (1990)

52% (1990)

56% (1988)

64% (1986)

55% (1985)

60% (1985)

56% (1991)

63% (1991)

66% (1992)

65% (1988)

39% (1995)

27% (1995)

45% (1992)

62% (1992)

55% (1993)

58% (1990)

25% (1985)