64% (2007)

72% (2004)

75% (2012)

68% (2008)

73% (2010)

56% (2012)

63% (2001)

62% (1985)

61% (2011)

68% (2011)

58% (2007)

63% (2003)

62% (1999)

67% (2013)

67% (1992)

64% (2011)

46% (2013)

45% (2000)

65% (2013)

47% (2002)