Recently, the highly respected English medical journal The Lancet published a research article examining rates of abortions worldwide and estimating how many are unsafe. As noted in the abstract of "Induced abortion: incidence and trends worldwide from 1995 to 2008":
The global abortion rate was stable between 2003 and 2008, with rates of 29 and 28 abortions per 1000 women aged 15—44 years, respectively, following a period of decline from 35 abortions per 1000 women in 1995. The average annual percent change in the rate was nearly 2·4% between 1995 and 2003 and 0·3% between 2003 and 2008. Worldwide, 49% of abortions were unsafe in 2008, compared to 44% in 1995. About one in five pregnancies ended in abortion in 2008. The abortion rate was lower in subregions where more women live under liberal abortion laws.
The conclusions won't be welcomed by people who are anti-choice, though that does nothing to change the facts (emphasis has been added):
The substantial decline in the abortion rate observed earlier has stalled, and the proportion of all abortions that are unsafe has increased. Restrictive abortion laws are not associated with lower abortion rates. Measures to reduce the incidence of unintended pregnancy and unsafe abortion, including investments in family planning services and safe abortion care, are crucial steps toward achieving the Millennium Development Goals.