Global Terrorism Index 2014: Measuring and Understanding the Impact of Terrorism
"Produced by the Institute for Economics and Peace (IEP), the GTI is based on data from the Global Terrorism Database (GTD) which is collected and collated by the National Consortium for the Study of Terrorism and Responses to Terrorism (START). The GTD is considered to be the most comprehensive dataset on terrorist activity globally and has codified over 125,000 terrorist incidents."
The Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11 (via Congressional Research Service)
From 9/11 To Osama Bin Laden's Death, Congress Spent $1.28 Trillion In War On Terror (via The Huffington Post)