72% (2009)

79% (1993)

76% (2006)

75% (1990)

82% (2006)

77% (2002)

67% (2002)

68% (1997)

61% (1998)

70% (2001)

60% (1999)

68% (2010)

69% (1998)

67% (1999)

76% (1988)

74% (2002)

67% (1996)

67% (2005)

65% (2000)

64% (2002)