Suicide attacks have been steadily increasing since 2010, according to Global Terrorism Database
Source: Global Terrorism Database, preliminary data for 2016
Note: Incidents occuring in the same geographic location and time are regarded as a single incident, but if either differ, the events are regarded as separate incidents. For example, during the July 7, 2007 London bombings, bombs exploded on four trains all in different locations. This is counted as four events, not one.
Sophie Chou / PRI