Terrorism incidence (scaled from 1 (very high) to 100 (no incidence)). This custom-built index is the weighted average of the number of terrorism-related casualties (injuries and fatalities) and the number of terrorist attacks, discounted by time. Each component is normalized separately and then averaged. Values range from 1 [highest incidence] to 100 [no incidence]. Original sources: National Consortium for the Study of Terrorism and Responses to Terrorism (START)