70% (1984)

72% (1985)

61% (1990)

62% (1992)

60% (1991)

60% (1985)

0% (1991)

53% (1990)

20% (1985)

58% (1990)

64% (1986)

56% (1991)

61% (1993)

67% (1992)

27% (1995)

37% (1995)

44% (1992)

48% (1997)

55% (1993)

57% (1995)