56% (1970)

50% (1991)

52% (2012)

55% (1961)

67% (1950)

55% (1960)

50% (1956)

44% (1979)

27% (2007)

50% (1954)

50% (1961)

50% (1955)

60% (1953)

53% (1958)

50% (1957)

50% (1966)