70% (2009)

77% (2008)

70% (1997)

64% (2006)

78% (2002)

75% (2003)

66% (2005)

70% (2002)

65% (2003)

74% (2004)

57% (2001)

68% (2004)

65% (2001)

69% (2007)

72% (2008)

60% (2010)

62% (2003)

75% (2008)

69% (1996)

62% (2007)