78% (1946)

58% (1996)

70% (1990)

68% (1987)

63% (1988)

58% (1987)

62% (1980)

72% (1993)

70% (1993)

68% (1994)

69% (1994)

76% (1994)

59% (1958)

60% (1985)

62% (1991)

63% (1995)

69% (1997)

61% (1995)

58% (1985)

62% (1923)