36% (1980)

45% (1979)

53% (1989)

59% (1986)

52% (1984)

52% (1985)

60% (1987)

48% (1987)

23% (1986)

40% (1987)

42% (1987)

50% (1987)

38% (1976)

0% (1969)

0% (1984)

0% (1983)

65% (1987)

70% (1986)