53% (1977)

72% (1982)

70% (1974)

62% (1973)

68% (1972)

63% (1973)

30% (1984)

69% (1975)

48% (1980)

67% (1983)

38% (1985)

62% (1984)

57% (1980)

45% (1985)

45% (1980)

62% (1979)

66% (1973)

67% (1973)

71% (1976)

59% (1980)