72% (1985)

70% (1984)

55% (1985)

57% (1991)

61% (1990)

52% (1990)

60% (1985)

48% (1997)

67% (1992)

56% (1991)

56% (1988)

64% (1986)

65% (1988)

27% (1995)

63% (1991)

61% (1993)

45% (1992)

58% (1990)

38% (1995)

57% (1995)