78% (2008)

78% (2002)

57% (2001)

70% (2009)

69% (1997)

66% (1999)

72% (2008)

69% (2007)

66% (2001)

76% (2003)

65% (2003)

70% (2002)

75% (2008)

60% (2006)

80% (2010)

62% (2007)

64% (2003)

65% (2000)

52% (2005)

67% (2004)