76% (1960)

67% (1980)

83% (1957)

71% (1959)

64% (1983)

59% (1975)

60% (1986)

62% (1955)

63% (1966)

65% (1959)

59% (1971)

64% (1960)

57% (1971)

35% (1957)

55% (1973)

55% (1957)

59% (1973)

73% (2009)

69% (1957)

58% (1957)