75% (1977)

70% (1984)

50% (1974)

65% (1983)

0% (1984)

76% (1980)

65% (1986)

70% (1978)

90% (1986)

50% (1977)

0% (1982)

70% (1983)

0% (1975)

70% (1985)

50% (1991)

80% (1988)

75% (1989)

73% (1984)

71% (1982)

68% (1973)