The Global Terrorism Index (GTI) ranks 158 countries based on the impact of terrorism in each of these countries. The rankings goes from 1 to 10, 1 being the lowest impact of terrorism and 10 the highest impact of terrorism. For 2011, the countries ranked at the top are Iraq, Pakistan, Afghanistan and India, followed by Yemen, Somalia, Nigeria, Thailand, Russia, the Philippines, Sudan, the Democratic Republic of Congo, Colombia and Syria.
The GTI uses four indicators to measure the impact of terrorism: number of incidents, number of deaths, injuries and property damage. A five year weighted average is also used in order to measure the lasting impact of terrorism in a particular country.
For more details see: Vision of Humanity – Global Terrorism Index