76% (2007)

70% (2008)

75% (2008)

73% (1993)

76% (2002)

78% (2013)

78% (2013)

78% (2010)

75% (2001)

81% (1973)

79% (2007)

74% (2004)

0% (2005)

60% (1994)

71% (1999)

79% (2002)

72% (1998)

76% (2013)

76% (1998)

77% (1989)