68% (1984)

50% (1976)

56% (1975)

73% (1986)

65% (1985)

64% (1980)

40% (1973)

62% (1988)

0% (1975)

60% (1968)

33% (1975)

0% (1971)

0% (1977)

40% (1984)

55% (1974)

68% (1976)

65% (1987)

68% (1983)

71% (1988)

69% (1986)