Tobacco contributes to more than 30 percent of cancer deaths.

Tax credits have contributed to about 20 percent of what has been built.

In turn, that has contributed to a doubling of inflation, despite price controls, to 71 percent last year.

The researchers calculated that the drugs had contributed to 29 percent of the deaths from stomach ulcers.

In the 2007 season, McGee contributed to 62 percent of the team's total offensive yards.

Year after year, most aircraft workers here contributed 2 percent to 10 percent of their pay to local charities.

But he is forecasting that it will also contribute to a slowing in the overall growth rate, to 2.7 percent for the year.

For instance, Ohio contributes to less than 5 percent of the smog problem in the Northeast.

United States sales contribute anywhere from 6 percent to 50 percent of these companies' revenues.

Biomass contributes to roughly four percent of our energy.