65% (1983)

60% (1980)

41% (1977)

65% (1976)

80% (1982)

93% (1990)

30% (1975)

90% (1986)

70% (1985)

50% (1987)

80% (1982)

70% (1984)

67% (1982)

70% (1980)

90% (1988)

33% (1974)

63% (1977)

80% (1984)

70% (1978)

70% (1983)