38% (1983)

55% (1987)

0% (1978)

65% (1989)

48% (1982)

59% (1989)

64% (1987)

67% (1980)

30% (1978)

70% (1977)

69% (1976)

52% (1984)

73% (1975)

65% (1980)

70% (1977)

52% (1987)

65% (1986)

0% (1978)

76% (1972)

69% (1986)