78% (2008)

78% (2002)

70% (2009)

76% (2003)

65% (2005)

69% (1997)

70% (2002)

52% (2005)

66% (1999)

69% (2007)

61% (2000)

63% (2001)

67% (2004)

75% (2008)

70% (2009)

66% (2001)

60% (2006)

62% (2007)

65% (2003)

57% (2001)