78% (2008)

78% (2002)

70% (2009)

69% (1997)

70% (2002)

69% (2007)

67% (2004)

66% (2001)

66% (1999)

60% (2006)

76% (2003)

75% (2008)

57% (2001)

52% (2005)

72% (2008)

80% (2010)

63% (2001)

65% (2003)

63% (2010)

55% (2005)