74% (1977)

64% (1973)

63% (1987)

68% (1981)

56% (1985)

36% (1983)

68% (1978)

68% (1985)

71% (1981)

65% (1972)

50% (1984)

62% (1986)

55% (1974)

43% (1987)

57% (1978)

60% (1982)

33% (1980)

35% (1978)

59% (1976)

52% (1975)