They were chosen to assure that each area in the city was represented in proportion to its population.

The exchanges were chosen so as to ensure that each area of the state was represented in proportion to its population.

Each city neighborhood should be represented at Stuyvesant in proportion to its population.

Finland is well represented in the UN civil service in proportion to its population and belongs to several of its specialised and related agencies.

The exchanges were chosen to make sure that each region of the country was represented in proportion to its population.

The group least represented in proportion to its population, Sinhalese Buddhists, accounted for an even smaller proportion of sergeants than they did of the force as a whole.

The original samples of telephone exchanges were selected by a computer, making sure that each region was represented in proportion to its population.

The exchanges were chosen to insure that each area in the city was represented inproportion to its population.

The sample of telephone exchanges called was selected by a computer to assure that each region of the country was represented in proportion to its population.

The exchanges were chosen so as to assure that each region or New York borough was represented in proportion to its population.