58% (1996)

60% (1951)

61% (2007)

67% (1998)

52% (1994)

58% (1983)

71% (1960)

65% (1983)

61% (1973)

66% (1983)

63% (1962)

68% (1988)

59% (1985)

61% (1976)

45% (1997)

60% (1996)

61% (1964)

65% (1974)

63% (2006)

53% (1980)