72% (1969)

79% (1988)

69% (1986)

52% (1976)

69% (1961)

68% (1947)

69% (1961)

59% (1985)

73% (1988)

69% (1976)

77% (1981)

67% (1967)

65% (1990)

65% (1974)

63% (1990)

0% (1979)

72% (1964)

78% (1980)

59% (1988)

69% (1984)