Suicide attacks in Iraq, Pakistan, and Afghanistan claimed 88 percent of casualties in 2009 and led the list in the first six months of 2010. But they were responsible for 71 percent of a smaller total in 2010.
Other countries have seen even more dramatic declines. The end of Sri Lanka's war with the Tamil Tigers saw suicide attacks drop from killing 46 in 2009 to none this year. In Saudi Arabia and Indonesia, which once confronted frequent Islamist suicide attacks, there were none.
High levels of violence and terrorism persist, but widespread fears that such tactics would proliferate after 9/11 haven't been borne out.
Robert Pape, a political science professor at the University of Chicago and coauthor of "Cutting the Fuse: The Explosion of Global Suicide Terrorism and How to Stop it," says suicide attacks fell in 2010 largely because of the withdrawal of US troops from Iraq. Only about 10 percent of people involved in what's usually termed terrorism set their eyes abroad, he argues, and most suicide attackers target local military occupations.
"The reason it's falling is because we're pulling out of Iraq," says Mr. Pape, adding that suicide attacks in Gaza and parts of the West Bank are also down "like 99 percent" because of the Israeli pullout. But he predicts that, as the war in Afghanistan ramps up and the drone war continues in Pakistan, suicide attacks in those areas are likely to rise. "All we're going to do is trade suicide attacks in Iraq for attacks in Afghanistan and Pakistan," he notes.