76% (2006)

79% (1993)

75% (1990)

77% (2002)

72% (2009)

68% (1997)

83% (2006)

65% (2002)

67% (2002)

64% (2002)

69% (1998)

61% (1998)

71% (1997)

70% (2001)

60% (1999)

75% (1988)

74% (1998)

68% (2010)

73% (1999)

67% (2008)