69% (1980)

52% (1985)

55% (1981)

54% (1981)

59% (1976)

52% (1985)

65% (1980)

62% (1986)

34% (1986)

75% (1984)

72% (1983)

70% (1986)

70% (1969)

10% (1981)

62% (1968)

72% (1975)

0% (1993)

30% (1978)

60% (1970)

80% (1986)