64% (1997)

55% (1955)

57% (1960)

53% (1983)

71% (1931)

47% (1993)

67% (1970)

69% (1944)

55% (1970)

58% (1990)

62% (1964)

70% (1928)

56% (1978)

67% (1977)

66% (1979)

54% (2000)

50% (2004)

58% (1964)

51% (1966)

71% (1950)