71% (1979)

52% (1964)

46% (1971)

70% (1961)

72% (1961)

75% (1972)

72% (1958)

68% (1979)

55% (1975)

64% (1962)

57% (1977)

32% (1968)

63% (1967)

58% (1958)

59% (1959)

65% (1971)

59% (1966)

57% (1962)

63% (1964)

42% (1979)