0% (1968)

59% (1976)

67% (1981)

52% (1985)

50% (1978)

72% (1975)

40% (1978)

60% (1970)

34% (1986)

70% (1987)

54% (1981)

50% (1972)

45% (1974)

40% (1974)

80% (1978)

0% (1982)

52% (1985)

60% (1972)

0% (1987)

72% (1981)