67% (2016)

65% (2018)

54% (2009)

35% (1976)

41% (1984)

67% (1964)

48% (1984)

61% (1982)

62% (2006)

51% (2008)

72% (1952)

64% (1982)

47% (2006)

59% (1984)

61% (1972)

57% (1983)

62% (1964)

65% (1955)

68% (1952)

45% (1989)