50% (2015)

40% (2010)

30% (2017)

70% (1974)

77% (1978)

68% (2014)

62% (1999)

68% (2003)

69% (2007)

67% (2012)

70% (1992)

63% (1982)

61% (2011)

0% (1966)

0% (1955)

76% (2005)

58% (1982)

74% (2009)

75% (1987)

70% (2014)