53% (2010)

64% (1979)

63% (2001)

51% (2004)

66% (1990)

69% (1937)

40% (1982)

43% (2009)

57% (1989)

45% (1970)

63% (1984)

69% (1996)

54% (2007)

49% (2009)

55% (1999)

65% (1977)

63% (2005)

62% (1990)

67% (1986)

59% (2006)