63% (1980)

78% (1946)

58% (1987)

72% (1993)

69% (1996)

58% (1996)

71% (1985)

61% (1995)

62% (1991)

70% (1993)

58% (1985)

68% (1987)

64% (1991)

61% (1992)

68% (1989)

52% (1988)

63% (1988)

62% (1995)

68% (1994)

62% (1996)