76% (2006)

71% (2003)

62% (2000)

76% (2011)

68% (1999)

73% (2007)

66% (2009)

37% (2004)

76% (2001)

75% (2006)

52% (2004)

63% (2008)

66% (2002)

68% (2010)

51% (1996)

70% (1994)

65% (2004)

39% (2000)

66% (2009)

54% (2001)