68% (1980)

70% (1978)

81% (1961)

69% (1963)

77% (1977)

72% (1977)

76% (1979)

46% (1993)

64% (1988)

69% (1949)

73% (1971)

61% (1973)

75% (1973)

61% (1954)

57% (1995)

77% (1961)

70% (1967)

67% (1971)

63% (1962)

71% (1968)