In 2011 there were 134 earthquakes in the same area, a sixfold increase over 20th century levels.

Between 1661 and 1675 there was a sixfold increase in population from 10,000 to 60,000.

In 2007, it released 97 original videos, a sixfold increase from 2005.

That growth includes a sixfold increase in its mutual fund assets since just 1995.

There was a sixfold increase in the British English corpus from 1976-1983.

He said the company had issued no news to account for the sixfold increase in its stock price.

Zenica had seen a sixfold increase in its population over 50 years.

But Democrats registered 300 watchers in the county, a sixfold increase.

Last spring, it sold again for $330,000, a sixfold increase in a decade.

Between 1661 and 1675 there was a sixfold increase in population.