51% (2014)

65% (1968)

62% (1957)

64% (1970)

56% (1964)

61% (1970)

60% (1972)

71% (1961)

62% (1963)

68% (1968)

65% (1961)

64% (1969)

62% (1970)

66% (1955)

56% (1973)

65% (1967)

66% (1958)

63% (1964)

77% (1973)

56% (2011)