59% (1980)

62% (1983)

56% (2007)

60% (1981)

68% (2001)

46% (2009)

71% (1962)

74% (2001)

42% (1988)

73% (1941)

53% (1994)

62% (1984)

72% (1933)

65% (1980)

68% (1994)

61% (1927)

49% (1978)

66% (1957)

66% (1975)

75% (2010)