55% (1987)

67% (1987)

57% (1986)

63% (1985)

53% (1987)

58% (1984)

63% (1984)

57% (1987)

65% (1985)

58% (1986)

60% (1986)

64% (1986)

62% (1984)

58% (1985)

61% (1985)

56% (1985)

57% (1985)

52% (1985)

54% (1986)

64% (1987)