52% (1953)

56% (1970)

50% (1991)

50% (1956)

53% (1955)

53% (1958)

50% (1955)

55% (1961)

50% (1954)

60% (1958)

44% (1979)

55% (1960)

50% (1960)

50% (1961)

50% (1966)

55% (1957)