59% (1982)

51% (1977)

80% (1976)

73% (1980)

63% (1961)

78% (1974)

70% (1978)

84% (1980)

82% (1978)

73% (1987)

70% (1980)

77% (1974)

76% (1977)

58% (1975)

62% (1984)

82% (1973)

82% (1975)

74% (1981)

64% (1987)

77% (1985)