76% (1972)

61% (2003)

64% (1989)

62% (2007)

69% (1955)

60% (2002)

63% (1984)

71% (1982)

69% (1970)

67% (1930)

68% (1978)

62% (1977)

48% (1979)

60% (2009)

53% (2006)

56% (2008)

60% (2006)

67% (1997)

77% (1991)

66% (1958)