78% (2002)

70% (2009)

65% (2005)

78% (2008)

66% (1999)

69% (2002)

70% (1997)

75% (2003)

66% (2001)

75% (2004)

65% (2006)

69% (2007)

65% (2000)

63% (2010)

71% (2013)

62% (2003)

57% (2001)

61% (2000)

55% (2002)

62% (2001)