59% (1982)

81% (1981)

84% (1980)

82% (1973)

51% (1977)

82% (1978)

67% (1988)

73% (1980)

58% (1976)

62% (1985)

77% (1974)

73% (1982)

80% (1976)

67% (1984)

82% (1975)

78% (1974)

73% (1980)

77% (1985)

70% (1980)

58% (1975)