The number of prostitutes has also doubled in the recent decade.

The price doubled in the next decade but then held steady for 40 years.

The number of students with limited English skills has doubled to five million in the last decade.

College costs have doubled in the past decade and are increasing at an annual rate of 9 percent.

"Hispanic buying power is going to double in the next decade."

Their country nearly doubled its presence on major league teams in the past decade.

The county's population more than doubled in the following decade.

But the number of fish raised on farms has doubled in the last decade.

Paper prices have more than doubled in the last decade, he said, to $750 a ton from $300.

If they fail, the ratio will nearly double in the next decade.