1.   Immigrants have swelled the population.

2.   The youthful immigrants who swelled the population were attracted not only from the Vale of York but from far beyond.

3.   Bugs also began reproducing earlier this spring, swelling populations above normal.

4.   It last boomed during World War II, when shipbuilding swelled the population and altered the character from a predominatly Catholic town to a more conservative Protestant one.

5.   Its population has been swelled by Saudis from all over the kingdom, drawn by hopes of securing royal patronage or government jobs.

6.   The fad in mandatory sentencing, and especially the fad in mandatory and long-term sentences for drug offences, has swelled prison populations massively in recent years.

7.   The influx of unskilled people from the countryside has swollen the population and taxed government services.

8.   The new arrivals have swelled the population of a village of straw huts that has sprung up next to the headquarters for the pipeline project.

9.   The vise has tightened over the past five years as new residents, many of them retirees, have flocked to Payson, swelling its population by a third.