56% (1960)

61% (1979)

0% (1989)

68% (1989)

40% (1971)

70% (1986)

79% (1980)

67% (1988)

73% (1988)

52% (1973)

59% (1985)

70% (1957)

78% (1983)

70% (1972)

72% (1965)

84% (1981)

70% (1965)

64% (1983)

70% (1955)

46% (1987)