48% (1965)

48% (1967)

46% (1969)

47% (1964)

43% (1967)

45% (1964)

30% (1965)

50% (1963)

38% (1967)

60% (1968)

50% (1972)

63% (1964)

70% (1962)

43% (1967)

47% (1962)

55% (1968)

50% (1966)

37% (1961)