69% (1997)

70% (2009)

78% (2008)

66% (1999)

64% (2003)

75% (2008)

69% (2007)

72% (2008)

70% (2009)

57% (2001)

71% (2013)

78% (2002)

52% (2005)

63% (2001)

62% (2007)

66% (2001)

67% (2004)

68% (2003)

68% (2004)

60% (2003)