63% (1980)

70% (1985)

70% (1993)

62% (1991)

58% (1987)

78% (1946)

76% (1994)

70% (1990)

46% (1994)

64% (1993)

70% (1991)

63% (1988)

60% (1985)

58% (1996)

69% (1997)

62% (1996)

68% (1994)

58% (1985)

68% (1987)

67% (1991)