43% (1938)

50% (1963)

61% (1949)

51% (1956)

55% (1955)

45% (1970)

50% (1948)

43% (1973)

37% (1993)

40% (1990)

50% (1949)

50% (1959)

50% (1957)

56% (1962)

50% (1962)