72% (1985)

70% (1984)

61% (1990)

57% (1991)

53% (1990)

64% (1986)

60% (1985)

67% (1992)

25% (1985)

65% (1988)

56% (1988)

58% (1990)

56% (1991)

63% (1991)

60% (1991)

62% (1992)

27% (1995)

20% (1985)

53% (1985)

45% (1992)