80% (1978)

74% (1977)

64% (1978)

72% (1978)

71% (1974)

70% (1983)

72% (1978)

69% (1982)

61% (1980)

56% (1971)

68% (1983)

61% (1977)

71% (1977)

69% (1982)

68% (1984)

63% (1971)

59% (1980)

67% (1970)

40% (1972)

66% (1980)