63% (1988)

70% (1993)

72% (1993)

68% (1994)

78% (1946)

69% (1996)

58% (1996)

61% (1985)

70% (1985)

66% (1992)

59% (1985)

61% (1995)

63% (1980)

69% (1987)

67% (1994)

61% (1992)

59% (1958)

69% (1991)

56% (1987)

60% (1992)