Traffic fumes accounted for a growing proportion of the problem.

This behavior may account for a large proportion of their rapid growth.

But they account for a dwindling proportion of the population.

Options trading, introduced in 1985, accounts for a sizable proportion of its business.

Official documents account for a large proportion of the primary sources.

However, these genes account for a small proportion of variance in reading disability, often less than 0.5%.

But full-timers account for a small proportion of the companies' total work force.

Even on small contracts, plant costs may account for a significant proportion of total costs.

Seafood has traditionally accounted for a large proportion of the local diet.

These diseases account for a large proportion of serious illness, but up to now have had only a small research budget.