72% (1969)

73% (1988)

69% (1961)

46% (1989)

52% (1973)

79% (1988)

69% (1961)

68% (1947)

43% (1976)

69% (1986)

65% (1990)

63% (1990)

70% (1955)

59% (1967)

77% (1981)

67% (1967)

52% (1976)

59% (1988)

69% (1984)

78% (1980)