The years since the massacre have brought a fourfold increase in violence against minors.

The new building represents a fourfold increase in gallery space, to 45,000 square feet.

Between 1940 and 1950, the population of Bayview saw a fourfold increase to 51,000 residents.

In some countries, a threefold or fourfold increase is expected.

Between 1890 and 1913 Cleveland had a fourfold increase in population.

By decade's end, the university's enrollment stood at 15,126 a more than fourfold increase from just twenty years prior.

Of those, 7.6 million were redeemed, which is more than a fourfold increase from 2001.

Women who used the pill 10 years or more had a fourfold increase in risk.

About 400,000 women finished a marathon in 1995, a fourfold increase over 1980.

Yet passengers numbered 80 million last year, a fourfold increase from 1991.