69% (1973)

63% (1970)

58% (1980)

70% (1937)

56% (1977)

55% (1930)

70% (1978)

76% (1979)

59% (1977)

60% (1967)

66% (1959)

77% (1961)

62% (1971)

67% (1956)

69% (2002)

72% (1960)

60% (1966)

76% (1975)

66% (1940)

67% (1995)