63% (2007)

72% (2004)

68% (2008)

73% (2010)

56% (2012)

69% (2011)

76% (2012)

61% (2011)

59% (2007)

62% (1985)

64% (2011)

62% (1999)

62% (2003)

46% (2013)

62% (2001)

53% (2010)

67% (2013)

57% (2002)

65% (2013)

58% (1999)