30% (1965)

47% (1964)

48% (1965)

42% (1966)

47% (1962)

50% (1967)

55% (1968)

38% (1967)

63% (1964)

43% (1967)

70% (1962)

37% (1961)

44% (1969)

45% (1964)

50% (1972)

43% (1967)

60% (1968)

50% (1963)