65% (1987)

63% (1985)

62% (1986)

57% (1987)

38% (1985)

55% (1986)

47% (1986)

57% (1986)

55% (1987)

55% (1981)

46% (1987)

68% (1988)

61% (1988)

59% (1988)

61% (1986)

57% (1989)

50% (1984)

54% (1985)

60% (1986)

55% (1987)