66% (2005)

70% (2009)

66% (1999)

78% (2002)

70% (1997)

78% (2008)

69% (2002)

76% (2003)

69% (2007)

66% (2001)

74% (2004)

62% (2003)

65% (2003)

62% (2007)

57% (2001)

72% (2008)

56% (2010)

63% (2010)

70% (1996)

60% (2006)