51% (1977)

38% (1977)

57% (1972)

69% (1957)

27% (1971)

45% (1971)

50% (1969)

42% (1970)

84% (1960)

45% (1959)

50% (1973)

30% (1971)

0% (1975)

49% (1970)

35% (1971)

50% (1964)

52% (1973)

60% (1971)

35% (1972)

73% (1972)