64% (1988)

70% (1993)

70% (1985)

66% (1992)

78% (1946)

73% (1993)

68% (1994)

58% (1996)

69% (1987)

63% (1980)

69% (1996)

69% (1994)

61% (1995)

65% (1987)

61% (1992)

59% (1958)

58% (1985)

67% (1994)

64% (1993)

67% (1991)