62% (1981)

55% (1992)

58% (1980)

56% (1991)

44% (1986)

57% (1985)

59% (1983)

69% (1986)

55% (1983)

82% (1990)

56% (1992)

64% (1984)

51% (1984)

62% (1980)

53% (1992)

72% (1991)

0% (1986)

45% (1986)

67% (1984)

56% (1987)