76% (2006)

74% (2006)

61% (2000)

71% (2003)

68% (1999)

69% (2005)

75% (2011)

75% (2006)

62% (1997)

72% (2007)

37% (2004)

66% (2007)

74% (1995)

67% (2009)

68% (2010)

52% (2004)

51% (1996)

67% (2009)

65% (2002)

54% (2001)