80% (1978)

73% (1977)

71% (1974)

71% (1978)

70% (1983)

63% (1978)

61% (1980)

71% (1977)

57% (1971)

72% (1978)

68% (1984)

69% (1982)

58% (1978)

60% (1977)

67% (1983)

69% (1982)

67% (1970)

64% (1970)

59% (1980)

55% (1980)