73% (1983)

76% (1984)

72% (1981)

73% (1975)

74% (1981)

66% (1986)

71% (1986)

67% (1985)

54% (1981)

65% (1987)

46% (1981)

69% (1986)

67% (1984)

34% (1986)

56% (1981)

59% (1989)

69% (1980)

0% (1974)

53% (1970)

0% (1985)