The total number of terrorist attacks worldwide in 2017 decreased by 23 percent and total deaths due to terrorist attacks decreased by 27 percent, compared to 2016. While numerous countries saw a decline in terrorist violence between 2016 and 2017, this overall trend was largely due to dramatically fewer attacks and deaths in Iraq. Twenty-four percent of all deaths in terrorist attacks in 2017 were perpetrator deaths, down from 26 percent in 2016. This statistic was historically much lower but began to increase in the 2000s, largely due to shifting tactics in Afghanistan and, to a lesser extent, in Iraq in the 2010s.
Sources: United States Department of State