46% (2007)

61% (2008)

20% (2012)

68% (1952)

55% (1975)

36% (1947)

74% (1964)

66% (1979)

64% (1996)

68% (2005)

51% (2003)

69% (1975)

70% (2010)

79% (2014)

55% (1988)

75% (2017)

44% (1999)

60% (1970)

73% (2011)

71% (1990)