73% (1978)

80% (1987)

69% (1967)

40% (1981)

0% (1987)

65% (1980)

85% (1979)

48% (1981)

20% (1982)

0% (1982)

70% (1980)

84% (1989)

50% (1989)

68% (1984)

64% (1988)

50% (1982)

68% (1983)

50% (1985)

0% (1980)

0% (1989)