68% (1967)

68% (1989)

70% (2005)

75% (2005)

60% (1997)

79% (2004)

73% (1994)

59% (1952)

89% (1999)

93% (2003)

87% (2011)

77% (2004)

74% (1990)

45% (1997)

84% (1987)

60% (1998)

74% (1999)

60% (2001)

80% (1999)

49% (2003)