59% (1982)

82% (1973)

51% (1977)

73% (1987)

70% (1980)

74% (1981)

77% (1974)

84% (1980)

63% (1988)

78% (1974)

82% (1978)

62% (1985)

76% (1977)

67% (1976)

67% (1988)

58% (1975)

60% (1983)

70% (1980)

63% (1980)

67% (1980)