82% (1973)

59% (1982)

73% (1987)

82% (1978)

60% (1972)

70% (1980)

63% (1980)

73% (1980)

84% (1980)

77% (1974)

80% (1976)

67% (1984)

82% (1975)

67% (1988)

63% (1961)

55% (1975)

78% (1974)

58% (1975)

51% (1977)

77% (1984)