53% (1960)

41% (1972)

75% (2011)

81% (2010)

63% (2011)

81% (2013)

59% (2015)

76% (2013)

49% (2005)

72% (2013)

50% (2012)

76% (2007)

53% (1978)

58% (1982)

59% (2002)

47% (2006)

70% (2013)

63% (2015)

47% (2014)

89% (2011)