73% (1965)

54% (2009)

57% (1969)

52% (2000)

52% (1989)

67% (1931)

68% (1956)

59% (1979)

68% (1981)

64% (1975)

60% (1977)

63% (1976)

50% (1984)

53% (1986)

70% (1972)

62% (1969)

62% (1989)

63% (1985)

57% (1960)

65% (1964)