11.   The population has doubled since then, with the state picking up one million residents just in the last decade.

12.   There, as the goose population has doubled every five years of late, the big honkers have become pests in the eyes of many people.

13.   Since then, China has doubled per capita grain availability even as its population has doubled, he said.

14.   One taxi driver estimated the city population doubles during the day with sellers and migrant workers.

15.   Several African countries, including Mali, Niger and Ghana, will see their populations double in one generation.