68% (2008)

63% (2007)

73% (2010)

48% (2013)

56% (2012)

72% (2004)

64% (2011)

68% (2011)

76% (2012)

62% (1999)

61% (2011)

62% (1985)

62% (2003)

41% (2000)

58% (2007)

65% (1989)

58% (2008)

53% (2002)

49% (1996)

67% (2013)