Increased contraceptive use has led to fewer abortions worldwide, but deaths from unsafe abortion remain a severe problem, killing 70,000 women a year, a research institute reported Tuesday in a major global survey.

More than half the deaths, about 38,000, are in sub-Saharan Africa, which was singled out as the region with by far the lowest rates of contraceptive use and the highest rates of unintended pregnancies.

The report, three years in the making, was compiled by the New York-based Guttmacher Institute, which supports abortion rights and is a leading source of data on abortion-related trends. Researchers examined data from individual countries and multinational organizations.

For the full report, click here.