70% (1997)

68% (2005)

71% (2013)

71% (2002)

56% (2007)

67% (2002)

56% (2007)

69% (2001)

66% (1999)

47% (2002)

64% (2006)

69% (2011)

66% (2000)

74% (2007)

55% (2010)

76% (2004)

71% (2007)

66% (2001)

64% (2008)

72% (2002)