64% (2007)

81% (2005)

59% (1996)

48% (2006)

80% (1990)

66% (1969)

43% (1964)

84% (2002)

60% (1999)

74% (1981)

58% (2002)

85% (1994)

80% (1954)

74% (1990)

67% (2010)

68% (2009)

66% (1999)

71% (1998)

76% (2009)

79% (2009)