70% (1993)

64% (1988)

68% (1994)

78% (1946)

73% (1993)

58% (1996)

71% (1985)

69% (1987)

66% (1992)

69% (1996)

62% (1995)

58% (1985)

61% (1995)

60% (1958)

67% (1991)

70% (1988)

59% (1987)

63% (1995)

64% (1993)

63% (1980)