59% (2012)

62% (2013)

59% (1992)

47% (1994)

58% (2011)

72% (2003)

64% (2009)

65% (2006)

67% (2015)

77% (1999)

77% (1963)

70% (1978)

66% (1981)

66% (2005)

62% (2015)

74% (1998)

73% (2001)

76% (2008)

62% (2011)

66% (2011)