71% (1977)

56% (1979)

50% (1976)

63% (1953)

66% (1959)

73% (1964)

62% (1957)

68% (1959)

50% (1979)

69% (1970)

54% (1975)

55% (1958)

54% (1979)

69% (1934)

51% (1969)

68% (1936)

63% (1947)

67% (1975)

67% (1947)

50% (1980)