47% (1964)

48% (1965)

30% (1965)

43% (1967)

38% (1967)

44% (1969)

43% (1967)

50% (1972)

63% (1964)

50% (1967)

45% (1964)

60% (1968)

55% (1968)

47% (1962)

70% (1962)

42% (1966)

37% (1961)

50% (1963)