47% (1964)

48% (1965)

38% (1967)

63% (1964)

43% (1967)

50% (1972)

47% (1962)

48% (1967)

30% (1965)

46% (1969)

60% (1968)

50% (1963)

45% (1964)

50% (1966)

70% (1962)

55% (1968)

43% (1967)

37% (1961)