55% (1996)

66% (2001)

70% (2001)

69% (2007)

57% (2007)

61% (2008)

72% (2005)

50% (2003)

61% (2009)

67% (2006)

67% (2006)

69% (2009)

63% (2004)

63% (2011)

50% (2012)

70% (2002)

65% (1999)

58% (2004)

66% (2004)

61% (2002)